Gap detection by the chinchilla.
Giraudi-D; Salvi-R; Henderson-D; Hamernik-R
J Acoust Soc Am 1980 Sep; 68(3):802-806
The ability to detect gaps, or silence intervals, in continuous noise was investigated in normal chinchillas. Wide band noise generated by from a noise generator was low pass filtered at either 6 or 10 kilohertz and presented at six levels between 23 and 77 decibels (dB) sound pressure level. (SPL). Five monaural adult chinchillas were trained to detect gaps in noise using a shock avoidance conditioning procedure. Animals were conditioned to respond to noise bursts of 500 milliseconds (ms) in a shock avoidance procedure. For gap detection, animals were presented with 100ms silent intervals separated by 750ms of noise; gap duration was gradually reduced to generalized the avoidance behavior. The point at which the performance deteriorated to less than 80 to 90 percent correct responses indicated the gap threshold. Twenty five trials were presented in random order at each gap duration. The minimum silent interval that could be detected by the chinchilla was shown to be about 3ms. These results agreed remarkably well with those from human studies. The authors conclude that since it is possible to create relatively selective lesions in the chinchilla cochlea, this animal can serve as a useful model for determining the anatomical structures which contribute to temporal resolution in mammals.
NIOSH-Publication; NIOSH-Grant; Noise-induced-hearing-loss; Laboratory-animals; Hearing-loss; Auditory-discrimination; Hearing
Callier Ctr/communic Disorders Callier Center 1966 Inwood Road Dallas, Tex 75235
Journal of the Acoustical Society of America
University of Texas Dallas, Richardson, Texas