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Figure 7


Fig. 7. The response of V1 neurone to ocellar stimuli that changed intensity at different rates. (A) V1 responses at six rates of change; black lines: instantaneous firing rates (see Materials and methods), scale bar, 50 spikes s-1; red lines: peristimulus spike histograms (5 ms bins); grey lines; time courses of the intensity changes, plotted as LED intensity difference=(left LED output-right LED output), scale bar, 2Imax. Stimuli ramped from -Imax to Imax and then back to -Imax, where Imax=max LED output. (B) The relative modulation, Rmod of V1 (see main text) plotted against the rate of change of ocellar intensity, expressed as Imax s-1. The data have been normalised to the range of responses between that elicited by a step stimulus (maximum Rmod) and by zero stimulus (minimum, but non-zero Rmod).





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