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Apraxia, agnosias, and higher visual function abnormalities

Correspondence to:
Correspondence to:
Dr John D W Greene
Southern General Hospital, Institute of Neurological Sciences, 1345 Govan Road, Glasgow, G51 4TF, UK; john.greene@sgh.scot.nhs.uk

Keywords: apraxia; agnosias; higher visual function abnormalities; disconnection syndromes

The first 150 words of the full text of this article appear below.

Cognitive neurology deals mainly with disorders of memory (for example, is the patient’s poor memory due to early dementia or to anxiety/depression?) or language (as in stroke). It should be remembered, however, that other areas of cognition may be selectively impaired. This review will cover disorders of perception and of higher order motor output, both in terms of pathological loss and pathological gain of function.

	PERCEPTION AND ITS DISORDERS

 
A patient must be conscious in order to perceive the world around them. An exploration of consciousness is outside the remit of this article though recently reviewed by others.^1,2 The patient must also have the capacity to attend selectively in order to focus on one part of the sensorium. Perceptual processing is then necessary to identify what is being perceived through the various sensory modalities (namely vision, hearing, touch, smell, taste), thus allowing access to semantic knowledge and through this understanding of the environment.

Initially, . . . [Full text of this article]