Relationship between light-evoked responses and light intensity.

<p>A-C: Examples of peristimulus time histograms and raster diagrams of responses of a VL neuron to trains of light pulses (5 pulses, 1.25 ms each, 30 Hz; bin size is 8.125 ms) of decreasing light intensity (32, 16 and 8 mW/mm², from A to C). Blue shading indicates light pulses. D: Light-evoked responses as light intensity is altered in one VL neuron. The examples in A, B and C are indicated. Red dots indicate experiments in which a significant increase in firing was observed during light stimulation.