Are there neurons detecting direction of sound source motion?

The activity of inferior colliculus single neurons was recorded extracellularly in cats anesthetized with chloralose and urethane. Binaurally presented trains of clicks were used as a sound signal, the time interval within each pair of clicks being diminished and then raised gradually. The use of the signal, which has some special features of a moving sound, models motion of the sound from one ear to the midline and backwards. It was possible to isolate units, which can fix some special features of this signal and respond to the direction of sound “motion” with a specific response. Different types of responses of these neurons are presented.