Temporal integration of acoustic signals by the budgerigar (M e l o p s i t t a c u s u n d u l a t u s)

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Abstract
Avoidance conditioning and a modified method of limits psychophysical procedure were used to study temporal integration of tone and noise signals in the budgerigar (M. undulatus). Integration of both tone and noise signals can be described by a negative exponential function with a time constant of .apprx. 200 ms. At very short durations there were differences in the integration of tone and noise signals. These data are similar to those reported for a number of other vertebrates, including man. Thresholds for 2 complex natural vocalizations of the budgerigar are similar to those of pure tones of equivalent duration.

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