Exam 3: The Visual Brain

The place in the visual pathway where the optic nerve from each eye splits in half is called the

The part of the visual pathway that has been described as a "volume control" is the

The right visual field is represented on the hemisphere of the brain.

Although a single simple cell would be unable to unambiguously determine the orientation of a bar,due to its inability to independently code orientation and contrast,a can resolve the ambiguity.

The lateral geniculate nucleus is composed of layers.

The magnocellular layers receive inputs from retinal ganglion cells,while the parvocel- lular layers receive inputs from retinal ganglion cells.

D.F. ,a woman who had suffered damage to her ventral pathway due to carbon monoxide poi- soning,was studied by Goodale et al.(1991)using the perceptual matching and posting tasks.The results showed that D.F.

This figure shows a bar of light impinging on the receptive fields of several RGCs.That pattern would produce response in the simple cell.

The dorsal pathway

The receptive fields of V1 neurons

The lateral geniculate nucleus is composed of layers;the first for the magno- cellular layers,and the next for the parvocellular layers.

Signals from the nasal retina of the left eye travel to the cerebral hemisphere of the brain.

Area V1 is called

A cortical column in area V1 includes layers of the cortex and is roughly mm in diameter.

The study by O'Connor et al.(2002),which used fMRI to investigate the effects of attention on the activity level of the left or right lateral geniculate nucleus,found that

Briefly describe the studies performed by Schiller and Logothetis (1990)and Ungerlieder and Mishkin (1982).What was similar about their methods? Describe the findings of each and ex- plain the reasoning they used to draw their final conclusions.

A(n)column consists of neurons with the same orientation tuning.

In Ungerleider and Mishkin's (1982)study of the ventral and dorsal pathways,monkeys were trained to find food in a covered bin using either a landmark or an object to identify the correct bin.Following lesions of the inferotemporal cortex they were no longer able to successfully

The koniocellular layers receive inputs from retinal ganglion cells.

The visual field is represented on the left cerebral cortex.