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Temporal pattern discrimination survives simultaneous bilateral
ablation of suprasylvian cortex but not sequential bilateral ablation of
insular-temporal cortex in the cat
Source: Brain Research 1979 Sep;173(2):337-340.
Author: Layton BS, Toga AW, Horenstein S, Davenport DG.
PubMed ID: 487094
Abstract:
It has been demonstrated by Colavita and others that bilateral simultaneous ablation of insular-temporal (I-T) cortex in the cat permanently disrupts a preoperatively demonstrated capacity to respond to a change in temporally organized patterns of stimuli whatever their modality. The evidence associating I-T cortex and the perception of temporal patterns is dependent upon a shuttle-box avoidance procedure developed by Diamond and Neff. A sequence of the form A-B-A serves as a continuing background stimulus where A and B are two different levels of auditory intensity, auditory frequency, visual intensity or vibrotactile intensity. At variable intervals, a warning signal of the form B-A-B replaces the background sequence. If the cat fails to cross into the other compartment of the shuttle-box after a specified number of presentations of the warning signal, it is driven across by foot-shock. METHODS: 4 adult cats were required to detect a change in a continuous auditory temporal pattern from soft-loud-soft to loud-soft-loud in two cases, and loud-soft-loud to soft-loud-soft in the other two. Each tone was 800 Hz and 900msec in duration and was separated by about 100 msec of silence. After achieving criterion performance of 18/20 correct detections on 2 successive days, large parts of the cortex of the suprasylvian gyrus were removed bilaterally in a single sitting in two cats. After a 2-week recovery period the animals were returned to the testing situation and regained criterion performance without delay. The other 2 cats received unilateral I-T lesions. After a 2 week recovery period they were retrained to criterion and then they were tested until it became apparent that no further increment in performance could occur. Neither of these cats had no difficulty in detecting a change from loud to soft of the reverse. DISCUSSION: These results appear to confirm the dependence of temporal pattern perception on the I-T region. Failure of the suprasylvian gyrus ablations to interfere wtih the capacity demonstrates that temporal pattern perception is not a function of any association cortex. Whether any other area of association cortex may be involved demands further research.
Source: Brain Research 1979 Sep;173(2):337-340.
Author: Layton BS, Toga AW, Horenstein S, Davenport DG.
PubMed ID: 487094
Abstract:
It has been demonstrated by Colavita and others that bilateral simultaneous ablation of insular-temporal (I-T) cortex in the cat permanently disrupts a preoperatively demonstrated capacity to respond to a change in temporally organized patterns of stimuli whatever their modality. The evidence associating I-T cortex and the perception of temporal patterns is dependent upon a shuttle-box avoidance procedure developed by Diamond and Neff. A sequence of the form A-B-A serves as a continuing background stimulus where A and B are two different levels of auditory intensity, auditory frequency, visual intensity or vibrotactile intensity. At variable intervals, a warning signal of the form B-A-B replaces the background sequence. If the cat fails to cross into the other compartment of the shuttle-box after a specified number of presentations of the warning signal, it is driven across by foot-shock. METHODS: 4 adult cats were required to detect a change in a continuous auditory temporal pattern from soft-loud-soft to loud-soft-loud in two cases, and loud-soft-loud to soft-loud-soft in the other two. Each tone was 800 Hz and 900msec in duration and was separated by about 100 msec of silence. After achieving criterion performance of 18/20 correct detections on 2 successive days, large parts of the cortex of the suprasylvian gyrus were removed bilaterally in a single sitting in two cats. After a 2-week recovery period the animals were returned to the testing situation and regained criterion performance without delay. The other 2 cats received unilateral I-T lesions. After a 2 week recovery period they were retrained to criterion and then they were tested until it became apparent that no further increment in performance could occur. Neither of these cats had no difficulty in detecting a change from loud to soft of the reverse. DISCUSSION: These results appear to confirm the dependence of temporal pattern perception on the I-T region. Failure of the suprasylvian gyrus ablations to interfere wtih the capacity demonstrates that temporal pattern perception is not a function of any association cortex. Whether any other area of association cortex may be involved demands further research.