 |
Workshop on the Auditory Basis of Speech PerceptionKeele University, UK |
 |
|
Workshop on the Auditory Basis of Speech PerceptionKeele University, UK |
|
The present study has examined how the temporal pattern of sound stimuli was represented in neurons of the primary auditory cortex (AI). We used adult Japanese monkeys (Macaca fuscata) prepared for chronic recording. Stimuli were tone bursts and temporally paired tone bursts. Unit recordings were made from the contralateral AI. During recording sessions, the animal was anesthetized with a mixture of nitrous oxide and oxygen. Post-stimulus-time histograms were analyzed. Results demonstrated that a single neuron in AI often showed totally different temporal response patterns when different frequencies were presented. Moreover, neurons of this type facilitatively responded to a temporally paired tone bursts of different frequencies with a particular interval (At). The interval which elicited the facilitation ranged from -50 msec up to -200 msec under the various conditions used. These neurons were sensitive to the At, frequencies and the order of presentation, implying that they are capable to represent temporally changing environmental sounds and communication sounds.
Bibliographic reference. Riquimaroux, Hiroshi (1996): "Processing of sound sequence in the auditory cortex", In ABSP-1996, 57-60.