Transient Frequency and Intensity Sensitivities of Central Auditory Neurons Determined with Sweep Tone

Tzai-Wen Chiu, Y. D. Liu, P. W.F. Poon*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

To determine the transient frequency and intensity sensitivities of central auditory neurons, we implemented an exponential sweep tone stimulus (2 sec in period, mean sweep rate 3.3 octave/sec), intensity of which varied systematically across trials. Response of single units to the stimulus was studied at the inferior colliculus (IC) of urethane-anesthetized rats. Most IC units responded to the sweep tone by one or more transient increases in discharge rate. The area of increased discharge, or response area (RA), was delineated on the frequency-intensity plane. The tip of RA gives the best frequency (BF) and minimum threshold (MT) of the cell. We also compared the BF and MT concurrently obtained with another method, viz., the conventional 'audio-visual' method of subjective judgment. Results showed that for the same population of cells (n=130), correlation between the two methods is better for BF (r=0.91) than for MT (r=0.78). Such discrepancy was discussed in relation to the response characteristics of these central auditory neurons.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalChinese Journal of Physiology
Volume41
Issue number3
StatePublished - 30 Sep 1998

Keywords

  • Best frequency
  • Inferior colliculus
  • Minimum threshold
  • Rat
  • Response area

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