Reverse correlation in macaque area MT
SourcePerception, 31, (2002), pp. 35
Article / Letter to editor
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We measured the temporal dynamics of direction/speed tuning and receptive field structure in motion-sensitive neurons of macaque area MT using a new reverse-correlation technique. For direction/speed tuning we presented a large random-pixel array covering the classical receptive field with motion impulses (8 - 13 ms) in eight different pseudo-random directions, at different speeds. For mapping the receptive-field structure, smaller patches were presented simultaneously at different locations with motion impulses either to the preferred or the anti-preferred direction. Spike trains of the neurons were recorded and reverse-correlated to the stimulus sequence. Although for some cells temporal tuning varied with direction, for most cells temporal characteristics were similar at different directions. The temporal response profiles were biphasic with an excitatory phase (40 - 70 ms) and a delayed inhibitory phase (80 - 100 ms). This biphasic characteristic was speed-dependent showing stronger biphasic profiles at higher stimulus speeds (30 - 40 deg s-1). The receptive-field-mapping measurements showed that the inhibitory surround is not evenly distributed, and that the response to the inhibitory surround is delayed to that of the centre (5 - 20 ms). The delayed response in the receptive-field surround suggests an extra processing stage for inhibitory input to the MT surround.
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