Far-field recordings of short latency auditory responses in the White Leghorn chick

Timothy A. Jones, Mary M. Beck, Holly M. Brown-Borg, Ray E. Burger

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Far-field recordings of short latency auditory responses were characterized in the White Leghorn chick (Callus domesticus, 2-3 weeks post hatch). Six to twelve positive peaks were normally present within the first 8 ms following the onset of a click stimulus (stimulus intensity = 99.0 ±6.3 dB pe SPL, 44.3 ±1.2 dB SL). Both cochlear microphonic (CM) and neural response components were distinguished based on functional criteria. Neural responses (P1a-P6b) were readily masked by white noise. CM responses were resistant to masking and inverted when click polarity was reversed. Systemic cooling produced shifts in neural response latencies such that later peaks (e.g. latencies ≥ P3) were delayed to a greater extent than early peaks (P1a and P2a). The latencies of CM components were relatively unaffected by cooling. The mean latencies and amplitudes were described quantitatively for dominant positive peaks. The mean auditory response threshold for 18 animals was 54.5 ±7 dB pe SPL. Dominant later components (P3a and the P3b/P4a complex) were the first to disappear after lethal injection of anesthetic. These were followed immediately by earlier neural peaks. CM components were the last to disappear. A working hypothesis is advanced regarding the distinction between central (P3a, P3b and P4a) and peripheral (P1a, P2a) neural components.

Original languageEnglish (US)
Pages (from-to)67-74
Number of pages8
JournalHearing Research
Volume27
Issue number1
DOIs
StatePublished - 1987

Keywords

  • Auditory brainstem response
  • Avian auditory response
  • Chick
  • Far-field recording
  • Peripheral
  • Short latency auditory response
  • brainstem auditory response

ASJC Scopus subject areas

  • Sensory Systems

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