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Perceptual Abilities (perceptual + ability)

Distribution by Scientific Domains
Medical Sciences70%
Psychology20%

Kinds of Perceptual Abilities

  • visual perceptual ability
    		•

    Selected Abstracts

    Assessment of cerebral visual impairment with the L94 visual perceptual battery: clinical value and correlation with MRI findings

    DEVELOPMENTAL MEDICINE & CHILD NEUROLOGY, Issue 3 2009
    E ORTIBUS MD
    In this article we describe visual perceptual abilities of a clinical population, referred for visual problems to our multidisciplinary team and assessed with the five computer tasks from the L94 visual perceptual battery. Clinical and neuroimaging findings were correlated with the findings on this task battery. Seventy children (35 males, 35 females) constituted our cohort. Age ranged from 4 to 20 years (mean 7y [SD 3y]). Forty children were born before 37 weeks gestational age. Thirty-six children had cerebral palsy (CP), of whom 24 had spastic diplegia, five had spastic hemiplegia, and four had spastic quadriplegia. Three children had ataxic CP. Perceptual visual impairment (PVI) was established in comparison to the performance age obtained on non-verbal intelligence subtests, instead of chronological age. Our results suggest that children with a history of preterm birth and a clinical CP picture are most at risk for a specific PVI. Correlations among other clinical variables did not define a clinical subgroup more at risk. Children with periventricular leucomalacia were almost equally represented in both PVI and non-PVI groups. Normal magnetic resonance imaging did not exclude the presence of PVI. In these children, however, we found another impairment profile, more in favour of dorsal stream impairment. [source]

    Effects of lorazepam on visual perceptual abilities

    HUMAN PSYCHOPHARMACOLOGY: CLINICAL AND EXPERIMENTAL, Issue 3 2008
    S. Pompéia
    Abstract Objective To evaluate the effects of an acute dose of the benzodiazepine (BZ) lorazepam in young healthy volunteers on five distinguishable visual perception abilities determined by previous factor-analytic studies. Methods This was a double-blind, cross-over design study of acute oral doses of lorazepam (2,mg) and placebo in young healthy volunteers. We focused on a set of paper-and-pencil tests of visual perceptual abilities that load on five correlated but distinguishable factors (Spatial Visualization, Spatial Relations, Perceptual Speed, Closure Speed, and Closure Flexibility). Some other tests (DSST, immediate and delayed recall of prose; measures of subjective mood alterations) were used to control for the classic BZ-induced effects. Results Lorazepam impaired performance in the DSST and delayed recall of prose, increased subjective sedation and impaired tasks of all abilities except Spatial Visualization and Closure Speed. Only impairment in Perceptual Speed (Identical Pictures task) and delayed recall of prose were not explained by sedation. Conclusion Acute administration of lorazepam, in a dose that impaired episodic memory, selectively affected different visual perceptual abilities before and after controlling for sedation. Central executive demands and sedation did not account for results, so impairment in the Identical Pictures task may be attributed to lorazepam's visual processing alterations. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    Electroconvulsive Therapy and the Fear of Deviance

    JOURNAL FOR THE THEORY OF SOCIAL BEHAVIOUR, Issue 1 2002
    James Giles
    After reaching the verge of obsolescence, electroconvulsive therapy (ECT) is once again on the increase. There remains, however, no sound theoretical basis for its use. By 1948 at least 50 different theories had been proposed to account for the workings of ECT. Today there are numerous more. Further, there is no good evidence for its therapeutic effectiveness. Although some studies show what are claimed to be positive results, others show significant amount of relapse, even with severe depression (the disorder against which ECT is supposed to be most effective), while even other studies show ECT to have little more effect than a placebo. Finally, there is much evidence for ECTs damaging effects, particularly to cognitive functioning like memory, general intelligence level, and perceptual abilities, and quite possibly to brain functioning. Some studies even suggest that the alleged therapeutic effects of ECT are essentially the effects of organic brain damage. The question, then, is why, despite these problems, does ECT continue to be used? ECTs salient features suggest an answer here. These are the features of dehumanization, power, control, punishment, and others, all of which can be traced back to the fear of deviant psychotic behavior. [source]

    Perceptual considerations in the use of colored photographic and video stimuli to study nonhuman primate behavior

    AMERICAN JOURNAL OF PRIMATOLOGY, Issue 11 2006
    Corri Waitt
    Abstract The use of photographs, slides, computerized images, and video to study behavior is increasingly being employed in nonhuman primates. However, since these mediums have been designed to simulate natural coloration for normal trichromatic human vision, they can fail to reproduce color in meaningful and accurate ways for viewers with different visual systems. Given the range of color perception that exists both across and within different species, it is necessary to consider this variation in order to discern the suitability of these mediums for experimental use. Because of the high degree of visual similarity among humans, Old World monkeys, and apes, the use of photographic and video stimuli should be acceptable in terms of replicating naturalistic coloration and making noticeable color manipulations. However, among New World primates and prosimians, there exists a considerable degree of variation in color perceptual abilities depending on the species, sex, and allelic combination of the animals involved. Therefore, the use of these mediums to study behavior is problematic for these species, and should be done with caution. Am. J. Primatol. 68:1054,1067, 2006. © 2006 Wiley-Liss, Inc. [source]

    Means-End Behavior in Young Infants: The Interplay of Action Perception and Action Production

    INFANCY, Issue 6 2009
    Moritz M. Daum
    In 2 experiments, the interplay of action perception and action production was investigated in 6-month-old infants. In Experiment 1, infants received 2 versions of a means-end task in counterbalanced order. In the action perception version, a preferential looking paradigm in which infants were shown an actor performing means-end behavior with an expected and an unexpected outcome was used. In the action production version, infants had to pull a cloth to receive a toy. In Experiment 2, infants' ability to perform the action production task with a cloth was compared to their ability to perform the action production task with a less flexible board. Finally, Experiment 3 was designed to control for alternative low-level explanations of the differences in the looking times toward the final states presented in Experiment 1 by only presenting the final states of the action perception task without showing the initial action sequence. Results obtained in Experiment 1 showed that in the action perception task, infants discriminated between the expected and the unexpected outcome. This perceptual ability was independent of their actual competence in executing means- end behavior in the action production task. Experiment 2 showed no difference in 6-month-olds' performance in the action production task depending on the properties of the support under the toy. Similarly, in Experiment 3, no differences in looking times between the 2 final states were found. The findings are discussed in light of theories on the development of action perception and action production. [source]

    Do prior knowledge, personality and visual perceptual ability predict student performance in microscopic pathology?

    MEDICAL EDUCATION, Issue 6 2010
    Laura Helle
    Medical Education 2010:44:621,629 Objectives, There has been long-standing controversy regarding aptitude testing and selection for medical education. Visual perception is considered particularly important for detecting signs of disease as part of diagnostic procedures in, for example, microscopic pathology, radiology and dermatology and as a component of perceptual motor skills in medical procedures such as surgery. In 1968 the Perceptual Ability Test (PAT) was introduced in dental education. The aim of the present pilot study was to explore possible predictors of performance in diagnostic classification based on microscopic observation in the context of an undergraduate pathology course. Methods, A pre- and post-test of diagnostic classification performance, test of visual perceptual skill (Test of Visual Perceptual Skills, 3rd edition [TVPS-3]) and a self-report instrument of personality (Big Five Personality Inventory) were administered. In addition, data on academic performance (performance in histology and cell biology, a compulsory course taken the previous year, in addition to performance on the microscopy examination and final examination) were collected. Results, The results indicated that one personality factor (Conscientiousness) and one element of visual perceptual ability (spatial relationship awareness) predicted performance on the pre-test. The only factor to predict performance on the post-test was performance on the pre-test. Similarly, the microscopy examination score was predicted by the pre-test score, in addition to the histology and cell biology grade. The course examination score was predicted by two personality factors (Conscientiousness and lack of Openness) and the histology and cell biology grade. Conclusions, Visual spatial ability may be related to performance in the initial phase of training in microscopic pathology. However, from a practical point of view, medical students are able to learn basic microscopic pathology using worked-out examples, independently of measures of personality or visual perceptual ability. This finding should reassure students about their abilities to improve with training independently of their scores on tests on basic abilities and personality. [source]

    Information provision to clients with stroke and their carers: Self-reported practices of occupational therapists

    AUSTRALIAN OCCUPATIONAL THERAPY JOURNAL, Issue 3 2010
    Louise Gustafsson
    Background:,The literature promotes the use of a wide range of educational materials for teaching and training clients with chronic conditions such as stroke. Client education is a valuable tool used by occupational therapists to facilitate client and carer ability to manage the stroke-affected upper limb. The aim of this study was to identify what information was provided to clients and carers, how this information was delivered, when the information was delivered and the client factors that influenced the method of information provision. Methods:,Convenience and snowball sampling was used to recruit occupational therapists working in stroke. Twenty-eight participants completed the study questionnaire anonymously and their responses were summarised descriptively. Results:,There was a clinically important trend for carers to receive less information than clients. Written and/or verbal information was the favoured method for delivering information related to handling (57%), soft-tissue injury minimisation (46.4%) and oedema management (50%). Information was delivered with decreasing frequency from admission (86%) to discharge (64%). More than 90% of participants indicated that the client's cognitive ability, visual ability, level of communication, primary language and perceptual ability were considered prior to the delivery of information. Discussion:,Participants regularly conveyed information to clients and carers with respect to management of the stroke-affected upper limb. However, an increased emphasis on the development of practical self-management skills, awareness of the impact of personal factors and a timeline for information provision may prove useful. [source]

    Bootstrapping Cognition from Behavior,A Computerized Thought Experiment

    COGNITIVE SCIENCE - A MULTIDISCIPLINARY JOURNAL, Issue 3 2008
    Ralf Möller
    Abstract We show that simple perceptual competences can emerge from an internal simulation of action effects and are thus grounded in behavior. A simulated agent learns to distinguish between dead ends and corridors without the necessity to represent these concepts in the sensory domain. Initially, the agent is only endowed with a simple value system and the means to extract low-level features from an image. In the interaction with the environment, it acquires a visuo-tactile forward model that allows the agent to predict how the visual input is changing under its movements, and whether movements will lead to a collision. From short-term predictions based on the forward model, the agent learns an inverse model. The inverse model in turn produces suggestions about which actions should be simulated in long-term predictions, and long-term predictions eventually give rise to the perceptual ability. [source]