PT - JOURNAL ARTICLE AU - Joydeep Bhattacharya AU - Hellmuth Petsche AU - Ernesto Pereda TI - Long-Range Synchrony in the γ Band: Role in Music Perception AID - 10.1523/JNEUROSCI.21-16-06329.2001 DP - 2001 Aug 15 TA - The Journal of Neuroscience PG - 6329--6337 VI - 21 IP - 16 4099 - http://www.jneurosci.org/content/21/16/6329.short 4100 - http://www.jneurosci.org/content/21/16/6329.full SO - J. Neurosci.2001 Aug 15; 21 AB - Synchronization seems to be a central mechanism for neuronal information processing within and between multiple brain areas. Furthermore, synchronization in the γ band has been shown to play an important role in higher cognitive functions, especially by binding the necessary spatial and temporal information in different cortical areas to build a coherent perception. Specific task-induced (evoked) γ oscillations have often been taken as an indication of synchrony, but the presence of long-range synchrony cannot be inferred from spectral power in the γ range. We studied the usefulness of a relatively new measure, called similarity index to detect asymmetric interdependency between two brain regions. Spontaneous EEG from two groups—musicians and non-musicians—were recorded during several states: listening to music, listening to text, and at rest (eyes closed and eyes open). While listening to music, degrees of the γ band synchrony over distributed cortical areas were found to be significantly higher in musicians than non-musicians. Yet no differences between these two groups were found at resting conditions and while listening to a neutral text. In contrast to the degree of long-range synchrony, spectral power in the γ band was higher in non-musicians. The degree of spatial synchrony, a measure of signal complexity based on eigen-decomposition method, was also significantly increased in musicians while listening to music. As compared with non-musicians, the finding of increased long-range synchrony in musicians independent of spectral power is interpreted as a manifestation of a more advanced musical memory of musicians in binding together several features of the intrinsic complexity of music in a dynamical way.