Abstract
Average evoked responses to near-threshold visual stimuli were recorded from 9 cats as they performed a stimulus detection task. The amplitude of response components in the optic tract and striate cortex was a logarithmic function of stimulus intensity. The amplitude of early response components in the lateral geniculate nucleus (LGN) and mesencephalic reticular formation (MRF) was predominantly a function of probability-of-seeing. Day to day variations in stimulus detectability were accompanied by corresponding changes in early response components at the LGN and MRF but not in responses in the optic tract and striate cortex. This indicates that a cat performing a stimulus detection task uses an early subcortical detecting system.
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