In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 108, No. 5_Supplement ( 2000-11-01), p. 2644-2644
Abstract:
Simultaneous experience of the same stimulus events in two distinct phenomenological modes is referred to as duplex perception (DP). The most widely investigated DP paradigm decomposes the formant pattern of the stop consonant-vowel (CV) syllables /ga/ and /da/ into two complementary portions: the isolated transient of the third formant (‘‘chirp’’) and the remaining sound structure (‘‘base’’). Presentation of the two syllable components to opposite ears results in the perception, first, of the chirp and, second, the fused CV syllable. In order to further elucidate the mechanisms underlying DP, the present study recorded mismatch fields in response to a series of dichotically applied base and chirp components using whole-head magnetencephalography (MEG). This magnetic analog to mismatch negativity is considered a correlate of early cognitive stimulus representation. (a) Under a visual distraction task, the preattentive mismatch fields were stronger in response to contralateral deviants and lateralized to the left hemisphere. (b) Under attention toward the fused percept /da/, left ear deviant chirps yielded an ipsilateral enhanced and posteriorly shifted reaction. These data suggest representations of the phonetic percepts in secondary dominant auditory cortex. Perception tasks may activate these templates for syllable fusion.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2000
detail.hit.zdb_id:
1461063-2
Bookmarklink