The Topography of Frequency and Time Representation in Primate Auditory Cortices

被引:23
作者
Baumann, Simon [1 ]
Joly, Olivier [1 ]
Rees, Adrian [1 ]
Petkov, Christopher I. [1 ]
Sun, Li [1 ]
Thiele, Alexander [1 ]
Griffiths, Timothy D. [1 ]
机构
[1] Newcastle Univ, Inst Neurosci, Sch Med, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
基金
英国惠康基金;
关键词
INFERIOR COLLICULUS; TONOTOPIC ORGANIZATION; AMPLITUDE-MODULATION; TEMPORAL ENVELOPE; CORTEX; PERIODICITY; FIELDS; SPEECH; INFORMATION; DIMENSIONS;
D O I
10.7554/eLife.03256
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Natural sounds can be characterised by their spectral content and temporal modulation, but how the brain is organized to analyse these two critical sound dimensions remains uncertain. Using functional magnetic resonance imaging, we demonstrate a topographical representation of amplitude modulation rate in the auditory cortex of awake macaques. The representation of this temporal dimension is organized in approximately concentric bands of equal rates across the superior temporal plane in both hemispheres, progressing from high rates in the posterior core to low rates in the anterior core and lateral belt cortex. In A1 the resulting gradient of modulation rate runs approximately perpendicular to the axis of the tonotopic gradient, suggesting an orthogonal organisation of spectral and temporal sound dimensions. In auditory belt areas this relationship is more complex. The data suggest a continuous representation of modulation rate across several physiological areas, in contradistinction to a separate representation of frequency within each area.
引用
收藏
页数:31
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