In a series of papers R . Tootell, M . Silverman, E . Switkes, R . De Valois, and others, showed : " i . " the columnar arrangement of neurons that respond to similar spatial frequencies in striate cortex;
22.
This information moves through an area of the brain called the lateral geniculate nucleus, located in the thalamus, and on to be processed in the primary visual cortex, area V1 ( also known as the striate cortex because of its striped appearance ).
23.
This showed that the monkey's ability to detect movement is separate from their ability to consciously detect an object in their deficit visual field, and gave further evidence for the claim that damage to the striate cortex plays a large role in causing the disorder.
24.
This theory is supported by findings that parafoveal retinal lesions deprive a region of striate cortex of visual input, and as a result, the receptive fields of neurons near the boundary of the deprived cortical region enlarge and expand into nearby regions of the visual field.
25.
He made the first single cell recordings from the superior colliculus of monkeys, and discovered the existence of a previously unsuspected capacity for vision after total lesions of the striate cortex ( a capacity which, when it was later confirmed in human beings, came to be called " blindsight " ).
26.
From the results of these single cell readings in the striate cortex and lateral geniculate, Hubel and Wiesel postulated that simple cortical receptive fields gain complexity and an intricate spatial arrangement through the patterned convergence of multiple " on " or " off " projections from lateral geniculate cells onto single cortical cells.
27.
This mechanism offers that after a focal lesion of neurons in striate cortex, or following a retinal lesion depriving these neurons of visual input, the receptive fields of nearby healthy neurons converge to code information about contours of objects normally coded by the damaged neurons while still coding the same information about retinal location prior to the injury.
