Abstract:
:The length of a vocal tract is reflected in the sound it is producing. The length of the vocal tract is correlated with body size and humans are very good at making size judgments based on the acoustic effect of vocal tract length only. Here we investigate the underlying mechanism for processing this main auditory cue to size information in the human brain. Sensory encoding of the acoustic effect of vocal tract length (VTL) depends on a time-stabilized spectral scaling mechanism that is independent of glottal pulse rate (GPR, or voice pitch); we provide evidence that a potential neural correlate for such a mechanism exists in the medial geniculate body (MGB). The perception of the acoustic effect of speaker size is influenced by GPR suggesting an interaction between VTL and GPR processing; such an interaction occurs only at the level of non-primary auditory cortex in planum temporale and anterior superior temporal gyrus. Our findings support a two-stage model for the processing of size information in speech based on an initial stage of sensory analysis as early as MGB, and a neural correlate of the perception of source size in non-primary auditory cortex.
journal_name
Neuroimagejournal_title
NeuroImageauthors
von Kriegstein K,Warren JD,Ives DT,Patterson RD,Griffiths TDdoi
10.1016/j.neuroimage.2006.02.045subject
Has Abstractpub_date
2006-08-01 00:00:00pages
368-75issue
1eissn
1053-8119issn
1095-9572pii
S1053-8119(06)00156-Xjournal_volume
32pub_type
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