[Neuronal reactions of the fastigial nucleus in the cat to sound signals].

28 out of 67 neurones of the fastigial nucleus responded to sound signals in anesthetized cats. Thresholds of the responses were over 72 dB in most of the neurones. Changes in intensity or duration of the sound signals were followed by insignificant changes in neuronal activity. An insignificant frequency selectivity (Q less than 0.2) was found in 8 (29%) neurones out of the 28. A considerable sensitivity was revealed in respect to the signals simulating spatial location or moving of the sound source. 13 out of 16 neurones (81%) responded to changes in interaural differences of the stimulation in time. Half of these neurones revealed the maximal changes of activity in interaural differences lesser than 50 microseconds (i.e. with the delays simulating the situation of the sound source near the midline of the head). 7 out of 18 neurones (39%) proved to be sensitive to "movement" of the sound source, each neuron having a preferential sensitivity to the movement with a certain speed.