Abstract
1. The spontaneous activity of 132 single LGN neurones was recorded prior to and following irrigation of the external auditory meatus from cats in light urethane-pentobarbitone anaesthesia with immobilized eyes. Caloric irrigation was administered in the case of 96 units; the remaining 36 units were controls for irrigation with water at body temperature. The data for each individual neurone were analyzed statistically. 2. It was found that the spontaneous activity of 71 % of the 96 LGN neurones studied was significantly changed by at least one kind of caloric irrigation. This percentage is significantly higher than the 17% of the control LGN neuronal sample (n = 36) whose spontaneous activity was influenced significantly by irrigation with water at 37°C. 3. The majority of LGN neurones were affected by only one kind of caloric irrigation (either warm or cold). Both activity enhancement and activity depression were observed. 4. Possible mediating pathways are discussed as well as the implications of the 0findings for opto-vestibular interactions at the cortical level.
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