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- W2017189074 abstract "In a fly, butterfly, locust and dragonfly we examined the responses of a variety of directional motionsensitive neurons which run from the brain down the ventral cord. The stimulus was a sinusoidally modulated moving pattern of regular stripes presented at a range of velocities in random order for either 0.1 s or 2.0 s. The response was measured as the total number of spikes to each stimulus. The neurons fall into two groups, ‘fast’ and ‘slow’. The responses of the fast type rise progressively to a peak contrast frequency at 15—20 Hz for all four insects, and decline at higher contrast frequencies. The responses of slow neurons rise rapidly to a peak at 1—10 Hz and then decline more slowly across the range where the fast neurons are at their peak. The existence of two groups of neurons with overlapping response ranges to different velocities of the same pattern, presented in exactly the same way, provides the insect with a means of measuring angular velocity irrespective of contrast, spatial frequency or intensity. As an input mechanism it is proposed that there are two types of unit motion detector, fast and slow, the latter being the main input to the optomotor system. It is also argued that even these inputs are not sufficient to provide a mechanism for the whole repertoire of normal insect vision." @default.
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- W2017189074 date "1992-04-22" @default.
- W2017189074 modified "2023-09-28" @default.
- W2017189074 title "On the existence of 'fast' and ‘slow' directionally sensitive motion detector neurons in insects" @default.
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- W2017189074 doi "https://doi.org/10.1098/rspb.1992.0041" @default.
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