Abstract
1. The light-evoked activity of 97 single LGN neurones was recorded from anaesthetised cats prior to and following caloric irrigation. The data from each individual neurone were analyzed statistically. 2. It was found that the light-evoked responses of 79% of the LGN neurones studied were significantly changed by at least one kind of caloric irrigation. This percentage is significantly higher than the 20% of a control LGN neuronal sample whose light-evoked responses were influenced significantly by irrigation with water at 37° C. 3. Both light-evoked activity enhancement and depression were observed. 4. For a given LGN neurone, caloric effects on its light-evoked responses are independent of those on its spontaneous activity. 5. Caloric irrigation often affects the light-evoked responses of only the centre or the periphery of a given LGN neurone's receptive field, thus upsetting the balance between these two antagonistic mechanisms.
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