Abstract:
:Information theoretical approaches to sensory processing in electric fish have focused on the encoding of amplitude modulations in a single sensory pathway in the South American gymnotiforms. To assess the generality of these studies, we investigated the encoding of amplitude and phase modulations in the distantly related African fish Gymnarchus. In both the amplitude- and time-coding pathways, primary afferents accurately estimated the time course of random modulations whereas hindbrain neurons extracted information about specific stimulus features. Despite exhibiting a clear preference for encoding amplitude or phase, afferents and hindbrain neurons could encode significant amounts of modulation of their nonpreferred attribute. Although no increase in feature extraction performance occurred where the two pathways converge in the midbrain, neurons there were increasingly sensitive to simultaneous modulation of both attributes. A shift from accurate stimulus estimation in the periphery to increasingly sparse representations of specific features appears to be a general strategy in electrosensory processing.
journal_name
J Comput Neuroscijournal_title
Journal of computational neuroscienceauthors
Carlson BA,Kawasaki Mdoi
10.1007/s10827-007-0062-6subject
Has Abstractpub_date
2008-08-01 00:00:00pages
1-24issue
1eissn
0929-5313issn
1573-6873journal_volume
25pub_type
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