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Perceptual

Distribution by Scientific Domains

Psychology	42%
Medical Sciences	18%
Life Sciences	16%
Humanities and Social Sciences	12%
Business, Economics, Finance and Accounting	10%

Terms modified by Perceptual

perceptual ability

perceptual analysis

perceptual category

perceptual evaluation

perceptual experience

perceptual knowledge

perceptual learning

perceptual load

perceptual organization

perceptual process

perceptual processing

perceptual range

perceptual salience

perceptual sensitivity

Selected Abstracts

Perceptual, motor and cognitive performance components of Bedouin children in Israel

OCCUPATIONAL THERAPY INTERNATIONAL, Issue 4 2000
Shula Parush PhD
Abstract The purpose of this study was to evaluate the perceptual, motor and cognitive performance abilities of Bedouin children as compared with mainstream Israeli children of the same age. The study population comprised two age groups (6,8 year olds and 10,12 year olds) living in two different types of settlements (rural and town). Participants included 20 children in each group. The Test of Visual-Perceptual Skills (TVPS), the Developmental Test of Visual-Motor Integration (VMI), selected subtests from the Bruininks-Oseretsky Test of Motor Proficiency and the Loewenstein Occupational Therapy Cognitive Assessment (LOTCA) were used. Older participants in all three groups performed better than the younger subjects. There were no significant differences between the two Bedouin groups in either age category. The mainstream Israeli subjects scored significantly higher than the two Bedouin groups on most variables tested. The lack of differences between the two Bedouin groups may indicate that the transition from nomadic communities to urban communities is mainly external and has not caused a significant change in perception, perceptual-motor and cognitive performance abilities. The results of this study may be used as a base for developing preventive intervention programmes to meet the specific needs of Bedouin children. A limitation of this study was the classification of the Bedouin population according to their dwelling place and not according to their sociodemographic background, such as parents' economic status, parents' education and so on. Recommendations for future research include expanding the number of participants, including children from additional rural schools of various distant tribes and incorporating more detailed cognitive assessments. Copyright © 2000 Whurr Publishers Ltd. [source]

The predictive validity of the Phelps Kindergarten Readiness Scale

PSYCHOLOGY IN THE SCHOOLS, Issue 5 2004
Kristine M. Augustyniak
This study assesses the predictive validity of the Phelps Kindergarten Readiness Scale (PKRS) for later academic achievement and explores the utility of a domain-specific measure of kindergarten readiness. Kindergarten readiness scores were significantly correlated with both math and language arts achievement as measured by New York State fourth-grade assessments for 148 students in a suburban, northeastern public school. In addition, each of the PKRS domains (Verbal, Perceptual, and Auditory) was correlated with later academic achievement. Two simultaneously calculated regression analyses showed that language arts skills were best predicted by the Verbal and Auditory domains of the PKRS and that math achievement was more complexly determined by all three readiness domains. Structural equation modeling using AMOS-4 showed that the latent construct readiness, as measured by the PKRS domain scores, was positively and significantly related to the latent construct academic achievement. Finally, this relationship held when age, gender, and behavioral indices at the time of kindergarten screening were used as moderator variables. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 509,516, 2004. [source]

Enhanced perceptual processing of speech in autism

DEVELOPMENTAL SCIENCE, Issue 1 2008
Anna Järvinen-Pasley
Theories of autism have proposed that a bias towards low-level perceptual information, or a featural/surface-biased information-processing style, may compromise higher-level language processing in such individuals. Two experiments, utilizing linguistic stimuli with competing low-level/perceptual and high-level/semantic information, tested processing biases in children with autism and matched controls. Whereas children with autism exhibited superior perceptual processing of speech relative to controls, and showed no evidence of either a perceptual or semantic processing bias, controls showed a tendency to process speech semantically. The data provide partial support to the perceptual theories of autism. It is additionally proposed that the pattern of results may reflect different patterns of attentional focusing towards single or multiple stimulus cues in speech between children with autism and controls. [source]

Neurophysiologic evaluation of early cognitive development in high-risk infants and toddlers

DEVELOPMENTAL DISABILITIES RESEARCH REVIEW, Issue 4 2005
Raye-Ann deRegnier
Abstract New knowledge of the perceptual, discriminative, and memory capabilities of very young infants has opened the door to further evaluation of these abilities in infants who have risk factors for cognitive impairments. A neurophysiologic technique that has been very useful in this regard is the recording of event-related potentials (ERPs). The event-related potential (ERP) technique is widely used by cognitive neuroscientists to study cognitive abilities such as discrimination, attention, and memory. This method has many attractive attributes for use in infants and children as it is relatively inexpensive, does not require sedation, has excellent temporal resolution, and can be used to evaluate early cognitive development in preverbal infants with limited behavioral repertories. In healthy infants and children, ERPs have been used to gain a further understanding of early cognitive development and the effect of experience on brain function. Recently, ERPs have been used to elucidate atypical memory development in infants of diabetic mothers, difficulties with perception and discrimination of speech sounds in infants at risk for dyslexia, and multiple areas of cognitive differences in extremely premature infants. Atypical findings seen in high-risk infants have correlated with later cognitive outcomes, but the sensitivity and specificity of the technique has not been studied, and thus evaluation of individual infants is not possible at this time. With further research, this technique may be very useful in identifying children with cognitive deficits during infancy. Because even young infants can be examined with ERPs, this technique is likely to be helpful in the development of focused early intervention programs used to improve cognitive function in high-risk infants and toddlers. © 2005 Wiley-Liss, Inc. MRDD Research Reviews 2005;11:317,324. [source]

Social experience organizes parallel networks in sensory and limbic forebrain

DEVELOPMENTAL NEUROBIOLOGY, Issue 3 2007
Eun-Jin Yang
Abstract Successful social behavior can directly influence an individual's reproductive success. Therefore, many organisms readily modify social behavior based on past experience. The neural changes induced by social experience, however, remain to be fully elucidated. We hypothesize that social modulation of neural systems not only occurs at the level of individual nuclei, but also of functional networks, and their relationships with behavior. We used the green anole lizard (Anolis carolinensis), which displays stereotyped, visually triggered social behaviors particularly suitable for comparisons of multiple functional networks in a social context, to test whether repeated aggressive interactions modify behavior and metabolic activity in limbic,hypothalamic and sensory forebrain regions, assessed by quantitative cytochrome oxidase (a slowly accumulating endogenous metabolic marker) histochemistry. We found that aggressive interactions potentiate aggressive behavior, induce changes in activities of individual nuclei, and organize context-specific functional neural networks. Surprisingly, this experiential effect is not only present in a limbic,hypothalamic network, but also extends to a sensory forebrain network directly relevant to the behavioral expression. Our results suggest that social experience modulates organisms' social behavior via modifying sensory and limbic neural systems in parallel both at the levels of individual regions and networks, potentially biasing perceptual as well as limbic processing. © 2007 Wiley Periodicals, Inc. Develop Neurobiol, 2007 [source]

Enhanced perceptual processing of speech in autism

Biased to learn language

DEVELOPMENTAL SCIENCE, Issue 6 2007
Núria Sebastián-Gallés
Some recent publications that explore the foundations of early language development are reviewed in this article. The review adopts the pivotal idea that infants' advancements are helped by the existence of different types of biases. The infant's discovery of the phonological properties of the language of the environment, as well as their learning of words, is assisted by different types of processing biases, ranging from perceptual to social factors. [source]

The development of sentence interpretation: effects of perceptual, attentional and semantic interference

DEVELOPMENTAL SCIENCE, Issue 6 2007
Robert Leech
How does the development and consolidation of perceptual, attentional, and higher cognitive abilities interact with language acquisition and processing? We explored children's (ages 5,17) and adults' (ages 18,51) comprehension of morphosyntactically varied sentences under several competing speech conditions that varied in the degree of attentional demands, auditory masking, and semantic interference. We also evaluated the relationship between subjects' syntactic comprehension and their word reading efficiency and general ,speed of processing'. We found that the interactions between perceptual and attentional processes and complex sentence interpretation changed considerably over the course of development. Perceptual masking of the speech signal had an early and lasting impact on comprehension, particularly for more complex sentence structures. In contrast, increased attentional demand in the absence of energetic auditory masking primarily affected younger children's comprehension of difficult sentence types. Finally, the predictability of syntactic comprehension abilities by external measures of development and expertise is contingent upon the perceptual, attentional, and semantic milieu in which language processing takes place. [source]

Conceptual representation of animacy and its perceptual and linguistic reflections

DEVELOPMENTAL SCIENCE, Issue 1 2003
Sandeep Prasada
No abstract is available for this article. [source]

Connectionist models of infant perceptual and cognitive development

DEVELOPMENTAL SCIENCE, Issue 2 2002
Leslie B. Cohen
No abstract is available for this article. [source]

The contribution of phonological awareness and visual attention in early reading and spelling

DYSLEXIA, Issue 1 2007
Monique Plaza
Abstract We examined the development of phonological processing, naming speed, and visual attention in kindergarten and addressed the question of their contribution to reading and spelling in grade 1. Seventy five French-speaking children were administered seven tasks at the two phases of the study, and reading and spelling were assessed in grade 1. The major findings revealed that syllable awareness and visual attention were the most important predictors of early reading and spelling, and confirm the influence of naming speed and phoneme awareness on specific skills. These observations strongly suggest that written language acquisition relies on linguistic, perceptual and cognitive cross-modal skills and highlight the need for diversifying written language measures and analyzing their specific predictors. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Measurement error: implications for diagnosis and discrepancy models of developmental dyslexia

DYSLEXIA, Issue 3 2005
Sue M. Cotton
Abstract The diagnosis of developmental dyslexia (DD) is reliant on a discrepancy between intellectual functioning and reading achievement. Discrepancy-based formulae have frequently been employed to establish the significance of the difference between ,intelligence' and ,actual' reading achievement. These formulae, however, often fail to take into consideration test reliability and the error associated with a single test score. This paper provides an illustration of the potential effects that test reliability and measurement error can have on the diagnosis of dyslexia, with particular reference to discrepancy models. The roles of reliability and standard error of measurement (SEM) in classic test theory are also briefly reviewed. This is followed by illustrations of how SEM and test reliability can aid with the interpretation of a simple discrepancy-based formula of DD. It is proposed that a lack of consideration of test theory in the use of discrepancy-based models of DD can lead to misdiagnosis (both false positives and false negatives). Further, misdiagnosis in research samples affects reproducibility and generalizability of findings. This in turn, may explain current inconsistencies in research on the perceptual, sensory, and motor correlates of dyslexia. Copyright © 2005 John Wiley & Sons, Ltd. [source]

Enhancing multisensory spatial orienting by brain polarization of the parietal cortex

EUROPEAN JOURNAL OF NEUROSCIENCE, Issue 10 2010
Nadia Bolognini
Abstract Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation technique that induces polarity-specific excitability changes in the human brain, therefore altering physiological, perceptual and higher-order cognitive processes. Here we investigated the possibility of enhancing attentional orienting within and across different sensory modalities, namely visual and auditory, by polarization of the posterior parietal cortex (PPC), given the putative involvement of this area in both unisensory and multisensory spatial processing. In different experiments, we applied anodal or sham tDCS to the right PPC and, for control, anodal stimulation of the right occipital cortex. Using a redundant signal effect (RSE) task, we found that anodal tDCS over the right PPC significantly speeded up responses to contralateral targets, regardless of the stimulus modality. Furthermore, the effect was dependant on the nature of the audiovisual enhancement, being stronger when subserved by a probabilistic mechanism induced by blue visual stimuli, which probably involves processing in the PPC. Hence, up-regulating the level of excitability in the PPC by tDCS appears a successful approach for enhancing spatial orienting to unisensory and crossmodal stimuli. Moreover, audiovisual interactions mostly occurring at a cortical level can be selectively enhanced by anodal PPC tDCS, whereas multisensory integration of stimuli, which is also largely mediated at a subcortical level, appears less susceptible to polarization of the cortex. [source]

Perirhinal cortex resolves feature ambiguity in complex visual discriminations

EUROPEAN JOURNAL OF NEUROSCIENCE, Issue 2 2002
Timothy J. Bussey
Abstract The present experiment tested predictions of a ,perceptual,mnemonic/feature conjunction' (PMFC) model of perirhinal cortex function. The model predicts that lesions of perirhinal cortex should disrupt complex visual discriminations with a high degree of ,feature ambiguity', a property of visual discrimination problems that can emerge when features of an object are rewarded when they are part of one object, but not when part of another. As feature ambiguity is thought to be the critical factor, such effects should be independent of the number of objects to be discriminated. This was tested directly, by assessing performance of control monkeys and monkeys with aspiration lesions of perirhinal cortex on a series of concurrent discriminations in which the number of object pairs was held constant, but the degree of feature ambiguity was varied systematically. Monkeys were tested in three conditions: Maximum Feature Ambiguity, in which all features were explicitly ambiguous (AB+, CD+, BC,, AD,; the biconditional problem); Minimum Feature Ambiguity, in which no features were explicitly ambiguous (AB+, CD+, EF,, GH,); and Intermediate Feature Ambiguity, in which half the features were explicitly ambiguous (AB+, CD+, CE,, AF,). The pattern of results closely matched that predicted by simulations using a connectionist network: monkeys with perirhinal cortex lesions were unimpaired in the Minimum Feature Ambiguity condition, mildly impaired in the Intermediate Feature Ambiguity condition and severely impaired in the Maximum Feature Ambiguity condition. These results confirm the predictions of the PMFC model, and force a reconsideration of prevailing views regarding perirhinal cortex function. [source]

The Defence Mechanism Test (DMT) revisited: experimental validation using threatening and non-threatening pictures

EUROPEAN JOURNAL OF PERSONALITY, Issue 4 2002
Bo Ekehammar
Although the Defence Mechanism Test (DMT) has been in use for almost half a century, it is still unclear what it actually measures. The psychodynamic theory on which the test is based states that the threatful DMT pictures activate various defence mechanisms. To test this proposition, the original DMT pictures were redrawn by a professional artist, changing the emotional content without altering the structural properties. In this way, a neutral and a friendly variant were shaped. Sixty participants were randomly assigned to the threatful, neutral, and friendly stimulus conditions. In contrast to predictions made from psychodynamic theory, that the threatful picture would activate more ,signs of defence' than the others, the results disclosed that the three conditions activated the same amounts of ,signs of defence' and the same levels of various perceptual thresholds. Thus, rather than capturing psychodynamic defence mechanisms, our results suggest that the DMT taps perceptual or information-processing difficulties in correct identification of brief stimulus exposures regardless of their emotional contents. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Voice profile after type I or II laser chordectomies for T1a glottic carcinoma

HEAD & NECK: JOURNAL FOR THE SCIENCES & SPECIALTIES OF THE HEAD AND NECK, Issue 11 2009
Elisabeth V. Sjögren MD
Abstract Background Can a "typical" voice in terms of auditory perception be defined after type I or II chordectomy? Do other parameters in a multidimensional voice protocol correlate to this perceptual profile? Methods Voice evaluation using a multidimensional voice protocol including perceptual (GRBAS; grade, roughness, breathiness, asthenia, strain scale), acoustic, aerodynamic, stroboscopic analyses, and self-assessment (Voice Handicap Index [VHI]) in a cohort of 37 consecutive patients with T1a midcord glottic carcinoma. Results Sixty-five percent of patients had dysphonia, dominated by mild breathiness (mean grade 1.4). Voice Handicap was minimal (mean VHI 19). Acoustic and aerodynamic parameters were only mildly deviant. The correlations between perceptual analysis and the other parameters were weak. Conclusion The typical laser treated voice (type I or II resections) is characterized by mild breathiness in perceptual analysis. Correlations with other parameters, including patients' self assessment, are weak. Therefore, these outcomes do not form 1 integrated voice profile. This may have consequences for clinical decision-making. © 2009 Wiley Periodicals, Inc. Head Neck, 2009 [source]

MEMORY, MEMORIALS, AND COMMEMORATION,

HISTORY AND THEORY, Issue 3 2008
ANITA KASABOVA
ABSTRACT According to a popular view, the past is present here and now. This is presentism combined with endurantism: the past continuously persists through time to the present. By contrast, I argue that memories, memorials, and histories are of entities discontinuous with present experiences, and that the continuity between past and present in them is a construct. Memories, memorials, and histories are semantic means for dealing with the past. My presupposition that past and present are different is supported by grammar: as verbal tenses show, the past is not present here and now, for otherwise it would not be past. A failure to note this difference is a lack of chronesthesia, a sense of time specific to human beings. I argue that presentism fails to account for the temporal structures of memory and the changes in perspective as we switch from the present to a past situation. My account is perdurantist in the sense that it allows for temporal parts of things such as memorials or tombstones, as well as events such as wars or commemorations. But my main goal is to outline a semantic approach to the past: the tie between past and present actions and events is the semantic ground,consequence relation: a past event is the antecedent grounding a present situation, explaining why it is the case. In addition, I show how we refer to the past by means of two rhetorical figures of speech: synecdoche, using the (emblematic-) part-whole relation for relating the past to the present by transposing its sense; and anaphor, which has a deictic function,it points back toward the past. In references to the past, the deictic field is a scene visualized by the speaker and addressees: the deictic field is transposed from a perceptual to an imaginary space. [source]

Accessing the mental space,Spatial working memory processes for language and vision overlap in precuneus

HUMAN BRAIN MAPPING, Issue 5 2008
Mikkel Wallentin
Abstract The "overlapping systems" theory of language function argues that linguistic meaning construction crucially relies on contextual information provided by "nonlinguistic" cognitive systems, such as perception and memory. This study examines whether linguistic processing of spatial relations established by reading sentences call on the same posterior parietal neural system involved in processing spatial relations set up through visual input. Subjects read simple sentences, which presented two agents in relation to each other, and were subsequently asked to evaluate spatial (e.g., "Was he turned towards her?") and equally concrete nonspatial content (e.g., "Was he older than her?"). We found that recall of the spatial content relative to the nonspatial content resulted in higher BOLD response in a dorsoposterior network of brain regions, most significantly in precuneus, strikingly overlapping a network previously shown to be involved in recall of spatial aspects of images depicting similar scenarios. This supports a neurocognitive model of language function, where sentences establish meaning by interacting with the perceptual and working memory networks of the brain. Hum Brain Mapp 2008. © 2007 Wiley-Liss, Inc. [source]

Cognitive effects of a Ginkgo biloba/vinpocetine compound in normal adults: systematic assessment of perception, attention and memory

HUMAN PSYCHOPHARMACOLOGY: CLINICAL AND EXPERIMENTAL, Issue 5 2001
John Polich
Abstract A computerized test battery was used in a double-blind design to assess the cognitive effects of a nutrient compound containing Ginkgo biloba in 24 normal adults. Ten tasks (perceptual, attention and short-term memory) were presented in a standardized manner designed to maximize performance, with substantial pre-test practice employed to minimize response variability. Subjects were given either placebo or Ginkgo biloba extract capsules to consume for 14 days, after which they performed all tasks twice. They then received the other condition, and after 14 days completed the final test session. Response time and error rate stabilized after pre-test practice. A ,working memory capacity' paradigm demonstrated a reliable 50,ms response time decrease between the placebo and Ginkgo biloba testing, suggesting that Ginkgo biloba speeds short-term working memory processing in normal adults. Copyright © 2001 John Wiley & Sons, Ltd. [source]

The relationship between the learning organization concept and firms' financial performance: An empirical assessment

HUMAN RESOURCE DEVELOPMENT QUARTERLY, Issue 1 2002
Andrea D. Ellinger
The concept of the learning organization has received considerable attention in the scholarly literature because superior learning processes have been heralded as a source of competitive advantage. Organizations that embrace strategies consistent with the learning organization are thought to achieve improved performance. Yet few empirical studies have examined the relationship between the learning organization concept and firms' financial performance. To assess this association, the authors obtained managerial responses to the Watkins and Marsick Dimensions of the Learning Organization Questionnaire (DLOQ©) instrument along with both perceptual and objective measures of firms' financial performance. Results suggest a positive association between the learning organization concept and firms' financial performance. The article discusses implications for research and practice. [source]

The Perceptions of Infant Distress Signals Varying in Pitch by Cocaine-Using Mothers

INFANCY, Issue 1 2003
Pamela Schuetze
Perceptual responses to infant distress signals were studied in 16 cocaine-using and 15 comparison mothers. All mothers rated tape recordings of 48 replications of a newborn infant's hunger cry digitally altered to increase in fundamental frequency in 100-Hz increments. Cries were rated on 4 perceptual (arousing, aversive, urgent, and sick) and 6 caregiving rating scale items (clean, cuddle, feed, give pacifier, pick up, and wait and see) used in previous studies. Analyses of variance showed that, as cry pitch increased, cries were rated as more arousing, aversive, and urgent sounding. The highest pitched cries received the highest ratings for caregiving interventions. Main effects for cocaine use showed cocaine-using mothers (a) rated cries as less arousing, aversive, urgent, and sick; (b) indicated they were less likely to pick up or feed the infant; and (c) indicated they more likely to give the crying infant a pacifier or just "wait and see." A Group x Cry Pitch interaction effect showed that mothers in the cocaine group gave higher ratings to wait and see as the pitch of the cries increased, whereas mothers in the comparison group gave lower ratings to wait and see as the pitch of the cries increased. These ratings indicate that cocaine-using mothers found cries to be less perceptually salient and less likely to elicit nurturant caregiving responses. These results suggest that maternal cocaine use is associated with altered perceptions of infant distress signals that may provide the basis for differential social responsivity in the caregiving context. [source]

The development and neural bases of face recognition

INFANT AND CHILD DEVELOPMENT, Issue 1-2 2001
Charles A. Nelson
Abstract Evidence from fields as diverse as cognitive, evolutionary, and developmental psychology, as well as cognitive neuroscience, has increasingly pointed to the ,special' nature of face recognition. A critical examination of the literature supports the view that faces begin to be seen as a separate class of objects within the first 6 months of life. Not surprisingly, the neural systems that underlie face recognition also come on line during this period of time. Less clear, however, are the mechanisms whereby these events occur. It seems likely that face recognition reflects an experience-expectant process, whereby exposure to faces during a sensitive period of development likely leads to perceptual and cortical specialization. However, it is unknown what the role of experience is in maintaining this ability, and how long this sensitive period lasts. After reviewing three related models that attempt to account for the way the ability to recognize faces develops, a number of suggestions are offered for testing the hypothesis that face recognition depends on experience for acquisition, and for evaluating the role of experience in maintaining this ability. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Perception and Politics in Intelligence Assessment: U.S. Estimates of the Soviet and "Rogue-State" Nuclear Threats

INTERNATIONAL STUDIES PERSPECTIVES, Issue 4 2009
James H. Lebovic
United States estimates of Soviet nuclear goals and capabilities and the current "rogue-state" nuclear threat reflected prevailing beliefs about threat within the U.S. government and the relative influence of agencies charged with threat assessment. This article establishes that the patterns in formal Soviet threat assessment: (i) did not reflect a uniform response to "external threat," (ii) were inevitably tied to underlying assumptions about adversary intent, and (iii) were susceptible then to perceptual, organizational, and/or political influences within government. Thus, threat assessments reflected the optimism and pessimism,and political interests and ideologies,of those who participated in the estimating process. The article concludes by examining these lessons in light of the experiences and challenges of assessing threat from small states harboring nuclear ambitions. [source]

Confidence and decision type under matched stimulus conditions: overconfidence in perceptual but not conceptual decisions

JOURNAL OF BEHAVIORAL DECISION MAKING, Issue 3 2008
Sara Kvidera
Abstract Within the domain of metacognition, there is disagreement whether different processes underlie evaluations of confidence in perceptual versus conceptual decisions. The relationship between confidence and accuracy for perceptual and conceptual decisions was compared using newly created stimuli that could be used to elicit either decision type. Based on theories of Brunswikian and Thurstonian uncertainties, significant underconfidence for perceptual decisions and overconfidence for conceptual decisions were predicted. Three within-subjects experiments did not support this hypothesis. Participants showed significant overconfidence for perceptual decisions and no overconfidence for conceptual decisions. In addition, significant hard-easy effects were consistently found for both decision types. Incorporating our findings with past results reveals that both over- and underconfidence are attainable on perceptual tasks. This conclusion, in addition to the common presence of hard-easy effects and significant across-task correlations in over/underconfidence, suggests that confidence judgments for the two decision types may depend on largely shared processes. Possible contributions to confidence and over/underconfidence are explored, focusing on response time factors and participants' knowledge bases. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Emotion recognition, emotional awareness and cognitive bias in individuals with bulimia nervosa

JOURNAL OF CLINICAL PSYCHOLOGY, Issue 6 2008
Tanja Legenbauer
Abstract Difficulties recognizing emotion have been reported for eating disordered individuals in relation to perception of emotions in others and emotional self-awareness. It remains unclear whether this is a perceptual or cognitive-affective problem. Clarification is sought and the question of a cognitive bias is addressed when interpreting facially expressed emotions. Twenty participants with bulimia nervosa (BN) and 20 normal controls (NC) were assessed for ability to recognize emotional and neutral expressions. Emotional self-awareness was also assessed. Significant differences were found for emotional self-awareness. For emotional faces, only a poorer recognition of the emotion, surprise, for BN was found. Problems with emotional self-awareness suggest a cognitive-affective disturbance in emotion recognition. Implications for therapy are discussed. © 2008 Wiley Periodicals, Inc. J Clin Psychol 64:687,702, 2008. [source]

Mediated Perceptions: Contributions of Phenomenological Film Theory to Understanding the Interactive Video Experience

JOURNAL OF COMPUTER-MEDIATED COMMUNICATION, Issue 4 2000
Tammy L. Bennington
We draw upon phenomenological film theory and phenomenological studies of technological mediation to explore the perceptual, expressive, intentional and interpretive dimensions of the interactive video experience. Surrealist and phenomenological film theory can provide insights into the perceptual and communicative dimensions of the film/video experience, complementing current semiotic explorations of hypertext. The phenomenological notion of ìintentionality is used to explain the convergence of both filmmaker's and spectator's perceptions onto the world as referenced by the filmmaker, enabling and mediating intersubjective understanding. Both the filmmaker's and the spectator's perceptions are brought into engagement through the technological mediation of camera and computer and through the linguistic and cultural mediation of narration. [source]

Vision-based terrain characterization and traversability assessment

JOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 10 2001
Ayanna Howard
This article presents novel techniques for real-time terrain characterization and assessment of terrain traversability for a field mobile robot using a vision system and artificial neural networks. The key terrain traversability characteristics are identified as roughness, slope, discontinuity, and hardness. These characteristics are extracted from imagery data obtained from cameras mounted on the robot and are represented in a fuzzy logic framework using perceptual, linguistic fuzzy sets. The approach adopted is highly robust and tolerant to imprecision and uncertainty inherent in sensing and perception of natural environments. The four traversability characteristics are combined to form a single Fuzzy Traversability Index, which quantifies the ease-of-traversal of the terrain by the mobile robot. Experimental results are presented to demonstrate the capability of the proposed approach for classification of different terrain segments based on their traversability. © 2001 John Wiley & Sons, Inc. [source]

Alcoholism and Dampened Temporal Limbic Activation to Emotional Faces

ALCOHOLISM, Issue 11 2009
Ksenija Marinkovic
Background:, Excessive chronic drinking is accompanied by a broad spectrum of emotional changes ranging from apathy and emotional flatness to deficits in comprehending emotional information, but their neural bases are poorly understood. Methods:, Emotional abnormalities associated with alcoholism were examined with functional magnetic resonance imaging in abstinent long-term alcoholic men in comparison to healthy demographically matched controls. Participants were presented with emotionally valenced words and photographs of faces during deep (semantic) and shallow (perceptual) encoding tasks followed by recognition. Results:, Overall, faces evoked stronger activation than words, with the expected material-specific laterality (left hemisphere for words, and right for faces) and depth of processing effects. However, whereas control participants showed stronger activation in the amygdala and hippocampus when viewing faces with emotional (relative to neutral) expressions, the alcoholics responded in an undifferentiated manner to all facial expressions. In the alcoholic participants, amygdala activity was inversely correlated with an increase in lateral prefrontal activity as a function of their behavioral deficits. Prefrontal modulation of emotional function as a compensation for the blunted amygdala activity during a socially relevant face appraisal task is in agreement with a distributed network engagement during emotional face processing. Conclusions:, Deficient activation of amygdala and hippocampus may underlie impaired processing of emotional faces associated with long-term alcoholism and may be a part of the wide array of behavioral problems including disinhibition, concurring with previously documented interpersonal difficulties in this population. Furthermore, the results suggest that alcoholics may rely on prefrontal rather than temporal limbic areas in order to compensate for reduced limbic responsivity and to maintain behavioral adequacy when faced with emotionally or socially challenging situations. [source]

Vision, Action, and Make-Perceive

MIND & LANGUAGE, Issue 4 2008
ROBERT EAMON BRISCOE
I argue inter alia that the enactive account falsely identifies an object's apparent shape with its 2D perspectival shape; that it mistakenly assimilates visual shape perception and volumetric object recognition; and that it seriously misrepresents the constitutive role of bodily action in visual awareness. I argue further that noticing an object's perspectival shape involves a hybrid experience combining both perceptual and imaginative elements,an act of what I call ,make-perceive'. [source]