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Low Literacy (low + literacy)
Selected AbstractsThe magnocellular theory of developmental dyslexiaDYSLEXIA, Issue 1 2001John Stein Abstract Low literacy is termed ,developmental dyslexia' when reading is significantly behind that expected from the intelligence quotient (IQ) in the presence of other symptoms,incoordination, left,right confusions, poor sequencing,that characterize it as a neurological syndrome. 5,10% of children, particularly boys, are found to be dyslexic. Reading requires the acquisition of good orthographic skills for recognising the visual form of words which allows one to access their meaning directly. It also requires the development of good phonological skills for sounding out unfamiliar words using knowledge of letter sound conversion rules. In the dyslexic brain, temporoparietal language areas on the two sides are symmetrical without the normal left-sided advantage. Also brain ,warts' (ectopias) are found, particularly clustered round the left temporoparietal language areas. The visual magnocellular system is responsible for timing visual events when reading. It therefore signals any visual motion that occurs if unintended movements lead to images moving off the fovea (,retinal slip'). These signals are then used to bring the eyes back on target. Thus, sensitivity to visual motion seems to help determine how well orthographic skill can develop in both good and bad readers. In dyslexics, the development of the visual magnocellular system is impaired: development of the magnocellular layers of the dyslexic lateral geniculate nucleus (LGN) is abnormal; their motion sensitivity is reduced; many dyslexics show unsteady binocular fixation; hence poor visual localization, particularly on the left side (left neglect). Dyslexics' binocular instability and visual perceptual instability, therefore, can cause the letters they are trying to read to appear to move around and cross over each other. Hence, blanking one eye (monocular occlusion) can improve reading. Thus, good magnocellular function is essential for high motion sensitivity and stable binocular fixation, hence proper development of orthographic skills. Many dyslexics also have auditory/phonological problems. Distinguishing letter sounds depends on picking up the changes in sound frequency and amplitude that characterize them. Thus, high frequency (FM) and amplitude modulation (AM) sensitivity helps the development of good phonological skill, and low sensitivity impedes the acquisition of these skills. Thus dyslexics' sensitivity to FM and AM is significantly lower than that of good readers and this explains their problems with phonology. The cerebellum is the head ganglion of magnocellular systems; it contributes to binocular fixation and to inner speech for sounding out words, and it is clearly defective in dyslexics. Thus, there is evidence that most reading problems have a fundamental sensorimotor cause. But why do magnocellular systems fail to develop properly? There is a clear genetic basis for impaired development of magnocells throughout the brain. The best understood linkage is to the region of the Major Histocompatibility Complex (MHC) Class 1 on the short arm of chromosome 6 which helps to control the production of antibodies. The development of magnocells may be impaired by autoantibodies affecting the developing brain. Magnocells also need high amounts of polyunsaturated fatty acids to preserve the membrane flexibility that permits the rapid conformational changes of channel proteins which underlie their transient sensitivity. But the genes that underlie magnocellular weakness would not be so common unless there were compensating advantages to dyslexia. In developmental dyslexics there may be heightened development of parvocellular systems that underlie their holistic, artistic, ,seeing the whole picture' and entrepreneurial talents. Copyright © 2001 John Wiley & Sons, Ltd. [source] Simplifying Detection of Cognitive Impairment: Comparison of the Mini-Cog and Mini-Mental State Examination in a Multiethnic SampleJOURNAL OF AMERICAN GERIATRICS SOCIETY, Issue 5 2005Soo Borson MD Objectives: To compare detection of cognitive impairment using the Mini-Cog and Mini-Mental State Examination (MMSE) and to identify sociodemographic variables that influence detection in an ethnoculturally diverse sample. Design: Cross-sectional. Setting: A registry of the University of Washington Alzheimer's Disease Research Center Satellite. Participants: A heterogeneous community sample (n=371) of predominantly ethnic minority elderly assessed using a standardized research protocol, 231 of whom met criteria for dementia or mild cognitive impairment (MCI). Measurements: Demographic data, a standardized research protocol for cognitive assessment and dementia diagnosis, MMSE, and Mini-Cog. Results: Both screens effectively detected cognitive impairment, the Mini-Cog slightly better than the MMSE (P<.01). Overall accuracy of classification was 83% for the Mini-Cog and 81% for the MMSE. The Mini-Cog was superior in recognizing patients with Alzheimer-type dementias (P=.05). Low education negatively affected detection using the MMSE (P<.001), whereas education did not affect the Mini-Cog, and low literacy minimally affected it. Conclusion: The Mini-Cog detects clinically significant cognitive impairment as well as or better than the MMSE in multiethnic elderly individuals, is easier to administer to non-English speakers, and is less biased by low education and literacy. [source] A health protection model for Hispanic adults with Type 2 diabetesJOURNAL OF CLINICAL NURSING, Issue 7b 2007Christine L Latham RN Aims., The Hispanic Health Protection Model (HHPM) was designed to assist practitioners' systematic assessment of Hispanic people to establish baselines and evaluate the success of early diabetes treatment. This article provides the research basis of the HHPM and related assessment tools. Background., The treatment of diabetes incorporates lifestyle change, and this adjustment is particularly important to follow with vulnerable groups. One such group is the Hispanic population, since the impact of diabetes is greatest on economically disadvantaged segments of this population, who suffer disproportionately higher Type 2 diabetes prevalence and higher levels of morbidity and mortality as compared with other populations. Traditional Hispanic health beliefs are often in conflict with Western medicine, so the adjustments to the lifestyle demands of this disease need to be evaluated. Methods., To understand this discrepancy fully in patient outcomes, a culturally sensitive assessment framework was developed based on health protection theories and research with Hispanic people with diabetes and, based on this framework, assessment tools were translated for use during interviews with low literacy, Spanish-speaking patients. Conclusions., The HHPM translated measures of premorbid lifestyle, health beliefs, support, self-efficacy, quality of life, knowledge of diabetes, and physiological parameters can be used during consecutive clinic visits during the first six months of therapy to map the success of patients' understanding of and psychological adjustment to diabetes. Relevance to clinical practice., The HHPM is a culturally-relevant, systematic, and holistic approach to assessing adjustment of Hispanic people to a new diagnosis of diabetes, including their psychological, cognitive, and physiological outcomes. Using this type of systematic approach will allow practitioners to target barriers to therapy, such as a lack of self-efficacy or incomplete knowledge of the disease and its treatment in a strategic manner to improve patient success in managing the complex lifestyle changes of diabetes mellitus. [source] The talking touchscreen: A new approach to outcomes assessment in low literacyPSYCHO-ONCOLOGY, Issue 2 2004Elizabeth A. Hahn Purpose. Cancer patients who are deficient in literacy skills are particularly vulnerable to experiencing different outcomes due to disparities in care or barriers to care. Outcomes measurement in low literacy patients may provide new insight into problems previously undetected due to the challenges of completing paper-and-pencil forms. Description of study. A multimedia program was developed to provide a quality of life assessment platform that would be acceptable to patients with varying literacy skills and computer experience. One item at a time is presented on the computer touchscreen, accompanied by a recorded reading of the question. Various colors, fonts and graphic images are used to enhance visibility, and a small picture icon appears near each text element allowing patients to replay the sound as many times as they wish. Evaluation questions are presented to assess patient burden and preferences. Results. An ethnically diverse group of 126 cancer patients with a range of literacy skills and computer experience reported that the ,talking touchscreen' (TT) was easy to use, and commented on the usefulness of the multimedia approach. Clinical implications. The TT is a practical, user-friendly data acquisition method that provides greater opportunities to measure self-reported outcomes in patients with a range of literacy skills. Copyright © 2003 John Wiley & Sons, Ltd. [source] | ||||||||||