Fig. 1.

All acoustic stimuli elicited bilateral activation of the auditory cortex. (A–C) Waveforms for the three categories of acoustic stimuli used in this study: coos (A), screams (B), and nonbiological sounds (C). Graphs illustrate the wide variation of acoustic morphology among conditions and how the nonbiological sound exemplars were selected to be within the same duration range of the species-specific calls. (D) Axial section shows significant bilateral STG activity to all acoustic stimuli in a single monkey.