Looming biases in monkey auditory cortex

Joost X. Maier, Asif A. Ghazanfar

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

Looming signals (signals that indicate the rapid approach of objects) are behaviorally relevant signals for all animals. Accordingly, studies in primates (including humans) reveal attentional biases for detecting and responding to looming versus receding signals in both the auditory and visual domains. We investigated the neural representation of these dynamic signals in the lateral belt auditory cortex of rhesus monkeys. By recording local field potential and multiunit spiking activity while the subjects were presented with auditory looming and receding signals, we show here that auditory cortical activity was biased in magnitude toward looming versus receding stimuli. This directional preference was not attributable to the absolute intensity of the sounds nor can it be attributed to simple adaptation, because white noise stimuli with identical amplitude envelopes did not elicit the same pattern of responses. This asymmetrical representation of looming versus receding sounds in the lateral belt auditory cortex suggests that it is an important node in the neural network correlate of looming perception.

Original languageEnglish (US)
Pages (from-to)4093-4100
Number of pages8
JournalJournal of Neuroscience
Volume27
Issue number15
DOIs
StatePublished - Apr 11 2007

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Keywords

  • Auditory motion
  • Gamma band
  • Lateral belt
  • Local field potential
  • Time to collision
  • Time to contact

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