Population-wide bias of surround suppression in auditory spatial receptive fields of the owl's midbrain

Yunyan Wang, Sharad J. Shanbhag, Brian J. Fischer, José L. Peña

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The physical arrangement of receptive fields (RFs) within neural structures is important for local computations. Nonuniform distribution of tuning within populations of neurons can influence emergent tuning properties, causing bias in local processing. This issue was studiedinthe auditory system ofbarn owls. The owl's external nucleusofthe inferior colliculus (ICx) contains a mapofauditory spacein which the frontal region is overrepresented. We measured spatiotemporal RFs of ICx neurons using spatial white noise. We found a population-wide bias in surround suppression such that suppression from frontal space was stronger. This asymmetry increased with laterality in spatial tuning. The bias could be explained by a model of lateral inhibition based on the overrepresentation of frontal space observedinICx. The model predicted trends in surround suppression across ICx that matched the data. Thus, the uneven distribution of spatial tuning within the map could explain the topography of time-dependent tuning properties. This mechanism may have significant implications for the analysis of natural scenes by sensory systems.

Original languageEnglish (US)
Pages (from-to)10470-10478
Number of pages9
JournalJournal of Neuroscience
Volume32
Issue number31
DOIs
StatePublished - Aug 1 2012

ASJC Scopus subject areas

  • Neuroscience(all)

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