Fig. 6
Light evokes different discharge kinetics in larval ganglion cells. A–C: mean firing rate waveforms are generated from all wavelengths and irradiances in C6 (27 stimuli) spectral protocols. These are subjective groupings of impulse-discharge kinetics. A: sustained-ON. The impulse discharge is elevated throughout the light step. B: transient-ON. The impulse discharge is complete within 300 ms and is followed by maintained suppression of activity for the remainder of the light pulse. C: ON-OFF. Separate discharge peaks occur at stimulus onset and offset. Inhibition appears during the later phase of stimulation. The ON-OFF dynamic may either be wavelength independent or arise from color opponency. D: frequency of occurrence of the sustained-ON, transient-ON, ON-OFF, and OFF temporal patterns. Purely OFF responses are rare under these stimulus conditions. WT, wild type. |