PSYCH306 Chapter 8: Psych 306 Ch. 8
28 Nov 2015
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Caused by opponent processes for motion detection. Motion involves a change in position over time. Logical place to start is with two adjacent receptors (neurons a and b) separated by a fixed distance. I. e. a bug would move through neuron a"s receptive field, then a short time later it would enter neuron b"s receptive field. In theory, a third cell that listens to neurons a and b should be able to detect this movement. Need two additional components in our neural circuit. 1st new cell d (receives input from neuron a + delays transmission of this input for a short period of time) Fires when cell a initially detects light, but quickly stops firing if the light remains shining on a"s receptive field. Cells b + d are then connected to neuron x (multiplication cell) Multiplication cell will fire only when both cells b + d are active. By delaying receptor a"s response (d) and then multiplying it by receptor.
