| Autor: |
Garcia-Lazaro JA; University Laboratory of Physiology, Parks Road, Oxford OX1 3PT, United Kingdom., Ahmed B, Schnupp JW |
| Jazyk: |
angličtina |
| Zdroj: |
Current biology : CB [Curr Biol] 2006 Feb 07; Vol. 16 (3), pp. 264-71. |
| DOI: |
10.1016/j.cub.2005.12.013 |
| Abstrakt: |
The amplitude and pitch fluctuations of natural soundscapes often exhibit "1/f spectra", which means that large, abrupt changes in pitch or loudness occur proportionally less frequently in nature than gentle, gradual fluctuations. Furthermore, human listeners reportedly prefer 1/f distributed random melodies to melodies with faster (1/f0) or slower (1/f2) dynamics. One might therefore suspect that neurons in the central auditory system may be tuned to 1/f dynamics, particularly given that recent reports provide evidence for tuning to 1/f dynamics in primary visual cortex. To test whether neurons in primary auditory cortex (A1) are tuned to 1/f dynamics, we recorded responses to random tone complexes in which the fundamental frequency and the envelope were determined by statistically independent "1/f(gamma) random walks," with gamma set to values between 0.5 and 4. Many A1 neurons showed clear evidence of tuning and responded with higher firing rates to stimuli with gamma between 1 and 1.5. Response patterns elicited by 1/f(gamma) stimuli were more reproducible for values of gamma close to 1. These findings indicate that auditory cortex is indeed tuned to the 1/f dynamics commonly found in the statistical distributions of natural soundscapes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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