Possible blindsight in infants lacking one cerebral hemisphere

Article Abstract:

Two infants who had undergone hemispherectomy or the removal of a cerebral hemisphere were tested for the effect on vision. Both infants showed evidence of blindsight or the ability to locate objects within the visual field despite being subjectively blind after injury to the striate cortex. Moreover, in both infants the subcortical cortex maintained control over the ability to focus on objects but not over binocular optokinetic nystagmus, indicating the complex interrelation of the cortical and subcortical visual systems among hemispherectomized children.

Case studies, Physiological aspects, Surgery, Visual perception, Cerebral hemispheres, Vision disorders in children, Childhood vision disorders

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Only one speed per object

Article Abstract:

Visual psychophysics involves the quantitative analysis of the sensitivity and precision of human judgements to determine the organizational intricacies of the visual system. Structuring of the visual field into two neighboring regions is a key process in perceptual organization. The determination of a simple psychophysical judgement of pattern speed is attributed to the grouping process.

Visual pathways, Psychophysics, Visual pathway

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A forkhead-domain gene is mutated in a severe speech and language disorder

Article Abstract:

Research describing some genetic aspects of speech disorders is presented. In particular the disruption of the gene FOXP2 and point mutations affecting the forkhead domain are investigated.

Genetic aspects, Language and languages, Human genetics, Speech

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