PSY280H1 Lecture Notes - Lecture 6: Temporal Lobe, Smooth Pursuit, Information Source
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Motion is a change in position over time. Start with two adjacent receptors: when those two fire we register change in position. We also need to somehow code the fact that there has been a delay, a change in time. The reichardt motion detector is is a very simple neural circuit based on delay and compare, made in the 1950s, which gives us an idea about motion. It"s going to fire only if signals both detectors arrive at the comparator at the same time. Reichardt motion detectors are tuned to particular speeds. If a moving object is too slow or too fsat, then signals will arrive at the comparators at different times. These motion detectors are also tunes to specific directions of motion: if an object moves in the wrong direction, then signals will arrive at the comparators at different times. Problem: reichardt detector may respond to stationary patterns or flicker.
