Differential neural responses to naturally occurring envelopes in the electrosensory system.

摘要: Natural sensory stimuli frequently consist of a fine structure whose amplitude (i.e. envelope) varies more slowly. Previous studies have demonstrated that envelope signals are found across systems and necessary for perception. For example, in the auditory system carry information pertaining to perception pitch fluctuations communication vocalizations [1], while envelopes visual responsible object grouping illusory contours [2,3]. However, neural mechanisms underlying encoding these poorly understood general. Gymnotiform wave-type weakly electric fish constitute an attractive model studying processing brain because its well-characterized anatomy physiology [4]. These generate around themselves weak quasi-sinusoidal field through organ discharge (EOD) [5]. Recent shown beat can vary time during different behavioral contexts display differential frequency content: caused by movement primarily contain low ( 1 Hz) temporal frequencies [7]. While it is known electrosensory neurons respond [7], whether differentially arising from social interaction unknown part their tuning has not been characterized. Here we used well established techniques [8] record pyramidal maps body surface within lateral line lobe (ELL) response with content spanning behaviorally relevant range (0.05-10 Hz). Using standard measures linear identification as quantitative methods theory, displayed responses contexts. Our results suggest about begins be segregated at level ELL provide new insights how encoded early pathways.