Speed-invariant encoding of looming object distance requires power law spike rate adaptation

Clarke S.E.; Naud R.; Longtin A.Maler L.

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Speed-invariant encoding of looming object distance requires power law spike rate adaptation

机译：Speed-invariant encoding of looming object distance requires power law spike rate adaptation

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摘要

Neural representations of a moving object's distance and approach speed are essential for determining appropriate orienting responses, such as those observed in the localization behaviors of the weakly electric fish, Apteronotus leptorhynchus. We demonstrate that a power lawformof spike rate adaptation transforms an electroreceptor afferent's response to looming object motion, effectively parsing information about distance and approach speed into distinct measures of the firing rate. Neurons with dynamics characterized by fixed time scales are shown to confound estimates of object distance and speed. Conversely, power law adaptation modifies an electroreceptor afferent's response according to the time scales present in the stimulus, generating a rate code for looming object distance that is invariant to speed and acceleration. Consequently, estimates of both object distance and approach speed can be uniquely determined from an electroreceptor afferent's firing rate, a multiplexed neural code operating over the extended time scales associated with behaviorally relevant stimuli.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第33期|13624-13629|共6页
作者
Clarke S.E.; Naud R.; Longtin A.Maler L.;
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作者单位

Departments of Cellular and Molecular Medicine, United States;

Physics, University of Ottawa, Ottawa, ON, K1H 8M5, Canada;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Neural coding; Perceptual invariance; Sensory transformations; Spike frequency adaptation;

Speed-invariant encoding of looming object distance requires power law spike rate adaptation

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