Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

The performance of two patients with visual agnosia was compared across a number of tests examining visual processing. The patients were distinguished by having dorsal and medial ventral extrastriate lesions. While inanimate objects were disadvantaged for the patient with a dorsal extrastriate lesion, animate items are disadvantaged for the patient with the medial ventral extrastriate lesion. The patients also showed contrasting patterns of performance on the Navon Test: The patient with a dorsal extrastriate lesion demonstrated a local bias while the patient with a medial ventral extrastriate lesion had a global bias. We propose that the dorsal and medial ventral visual pathways may be characterized at an extrastriate level by differences in local relative to more global visual processing and that this can link to visually based category-specific deficits in processing.

Original publication

DOI

10.1080/02643290701848901

Type

Journal article

Journal

Cogn Neuropsychol

Publication Date

02/2008

Volume

25

Pages

56 - 92

Keywords

Aged, 80 and over, Agnosia, Attention, Brain Mapping, Contrast Sensitivity, Depth Perception, Discrimination Learning, Dyslexia, Female, Field Dependence-Independence, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Neuropsychological Tests, Pattern Recognition, Visual, Prosopagnosia, Psychomotor Performance, Reaction Time, Size Perception, Stroke, Visual Acuity, Visual Cortex, Visual Pathways