Abstract
Flash intensity (5 levels) and background illumination (no background and 5 levels) effects on the photic evoked potential were recorded from the optic tectum of the unanesthetized pigeon. As flash intensity increased, the response latency decreased and amplitude increased. As background level increased, little effect on latency was found except at low flash levels. However, a complex relation was found for the background effects on response amplitudes. For most flash intensities, low background levels had no effects or slightly potentiated the response amplitude, while at higher background levels, the response was suppressed. The flash intensity, background level interaction was discussed in terms of brightness contrast relations.
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