01:830:301 Lecture Notes - Lecture 13: Motion Detector, Magnocellular Cell, Parietal Eye
2 May 2016
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Building a global-motion detector: you have to pull all info together to see the moving squares o. Lesions in magnocellular layers of lgn impair perception of large, rapidly moving objects. Middle temporal lobe (area mt) a brain region that plays an important role in motion perception: vast majority of neurons in mt are selective for motion in a particular direction. Newsome and pare- study on motion perception in monkeys: trained monkeys to respond to correlated dot motion displays, mt area was lesioned, monkeys needed about 10x as many dots to correctly identify direction of motion. Disadvantages of lesion studies to study motion- lesions may be incomplete or influence other structures. Electrical stimulation of mt neurons- biases motion detection in the direction the mt neuron responds to. Akinetopsia- rare neurophysiological disorder in which the affected individual has no perception of motion: caused by disruption to cortical area mt.
