Temporal specificity of perceptual learning in an auditory discrimination task

被引:98
作者
Karmarkar, UR
Buonomano, DV [1 ]
机构
[1] Univ Calif Los Angeles, Dept Neurobiol, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Psychol, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, Brain Res Inst, Los Angeles, CA 90095 USA
关键词
D O I
10.1101/lm.55503
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Although temporal processing is used in a wide range of sensory and motor tasks, there is little evidence is to whether a single centralized clock or a distributed system underlies timing in the range of tens to hundreds of milliseconds. We investigated this question by studying whether learning on an auditory interval discrimination task generalizes across stimulus types, intervals, and frequencies. The degree to which improvements in timing carry over to different stimulus features constrains the neural mechanisms underlying timing. Human subjects trained on a 100- or 200-msec interval discrimination task showed an improvement in temporal resolution. This learning generalized to a perceptually distinct duration stimulus, as well as to the trained interval presented with tones at untrained spectral frequencies. The improvement in performance (lid not generalize to untrained intervals. To determine if spectral generalization was dependent on the importance of frequency information in the task, subjects were simultaneously trained on two different intervals identified by frequency. As a whole, our results indicate that the brain uses circuits that are dedicated to specific time spans, and that each circuit processes stimuli across nontemporal stimulus features. The patterns of generalization additionally indicate that temporal learning does not rely on changes in early, subcortical processing, because the nontemporal features are encoded by different channels at early stages.
引用
收藏
页码:141 / 147
页数:7
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