Title

Listening for the norm: adaptive coding in speech categorization.

Date of Original Version

1-1-2012

Type

Article

PubMed ID

22347198

Rights Management

This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permission

Abstract or Description

Perceptual aftereffects have been referred to as "the psychologist's microelectrode" because they can expose dimensions of representation through the residual effect of a context stimulus upon perception of a subsequent target. The present study uses such context-dependence to examine the dimensions of representation involved in a classic demonstration of "talker normalization" in speech perception. Whereas most accounts of talker normalization have emphasized talker-, speech-, or articulatory-specific dimensions' significance, the present work tests an alternative hypothesis: that the long-term average spectrum (LTAS) of speech context is responsible for patterns of context-dependent perception considered to be evidence for talker normalization. In support of this hypothesis, listeners' vowel categorization was equivalently influenced by speech contexts manipulated to sound as though they were spoken by different talkers and non-speech analogs matched in LTAS to the speech contexts. Since the non-speech contexts did not possess talker, speech, or articulatory information, general perceptual mechanisms are implicated. Results are described in terms of adaptive perceptual coding.

DOI

10.3389/fpsyg.2012.00010

 

Published In

Frontiers in Psychology, 3, 10-10.