Accession Number:

ADA229472

Title:

Mechanisms Mediating the Perception of Complex Acoustic Patterns

Descriptive Note:

Annual progress rept. 1 Nov 1989-30 Sep 1990,

Corporate Author:

WISCONSIN UNIV-MILWAUKEE DEPT OF PSYCHOLOGY

Personal Author(s):

Report Date:

1990-11-09

Pagination or Media Count:

106.0

Abstract:

Five studies were completed 1 It was found that, following repetition, long period 500 ms random waveforms excised from Gaussian noise could be identified when embedded in longer segments of Gaussian noise even when the inter-stimulus interval exceeded the limits of echoic memory 2 It was demonstrated that some spectral regions of these long-period random waveforms could be recognized with greater accuracy than others 3 Experiments with three consecutive odd-numbered harmonics demonstrated that triads with low harmonic numbers have a pitch corresponding to the fundamental of the harmonic series, but triads centered at the 9th or 11th harmonic had pitches roughly one octave higher. Deviations from the octave were consistent with the waveform pseudoperiodicities. These pitch judgements have implications for theories concerning the bases from the dominant region of complex tones. Two series of experiments involving 4 the vowel conversion effect and 5 dichotic verbal transformations, which compared the rules governing perceptual organization of speech in Japanese and English, were carried out by the principal investigator during May and June at the Basic Research Laboratories of the Nippon Telegraph and Telephone Co., Tokyo. RH

Subject Categories:

  • Cybernetics
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE