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Abstract
Several experiments involving binaural records of cochlear potentials in the guinea-pig are described. The conductive properties of the two ears were studied as a function of frequency and intensity. The variations of the responses were observed when the azimuth of the sound source was modified, and also, in the case of bone-conducted tones, when the point of application of the receiver on the cranium was changed. In another series of experiments, the possible role of the ossicular muscles contractions in directional hearing was investigated on wakeful animals.