Abstract
Effects of altering the spatial location of a tonal sound source were studied in single neurons in the inferior colliculus of unanaesthetized, restrained cats. Speaker position was altered by successive 22.5° displacements in an arc in the horizontal plane around the animal's head. Thresholds for evoked activity in some units were dependent on sound location, but threshold changes for a 22.5° displacement in sound position never exceeded 10 dB. Spike counts of most units changed in a systematic fashion with changes in sound location, the usual pattern of change consisting of a maximum value at some point in the contralateral field and a gradual decline as speaker location was displaced from the most effective position. Discharge patterns of approximately 50% of units were dependent on sound location. The results are compatible with the concept of ‘place coding’ of spatial location.
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