Accession Number:

ADA455589

Title:

Ripple Analysis in Ferret Primary Auditory Cortex. 3. Prediction of Unit Responses to Arbitrary Spectral Profiles

Descriptive Note:

Technical research rept.

Corporate Author:

MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH

Personal Author(s):

• Shamma, Shihab A.
• Versnel, Huib

Report Date:

1995-01-01

Pagination or Media Count:

30.0

Abstract:

We examined whether Al responses to arbitrary spectral profiles can be explained by the superposition of responses to the individual ripple components that make up the spectral pattern. For each unit, the ripple transfer function was first measured using ripple stimuli consisting of broadband complexes with sinusoidally modulated spectral envelopes Shamma et al. 1994. Unit responses to various combinations of ripples were compared to those predicted from the superposition of responses according to the transfer function. Spectral profiles included combinations of 2-5 ripples of equal amplitudes and random phases, and vowel-like profiles composed of 10 ripples with various amplitudes and phases. The results demonstrate that predicted and measured responses are reasonably well matched, and hence support the notion that Al analyzes the acoustic spectrum in a substantially linear manner.

Descriptors:

• *AUDITORY PERCEPTION
• *BIOPHYSICS
• TRANSFER FUNCTIONS
• ACOUSTIC WAVES
• PROFILES
• BROADBAND
• RIPPLES
• STIMULI
• SPECTRUM ANALYSIS
• FREQUENCY RESPONSE

Subject Categories:

• Anatomy and Physiology
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE