Gamma-band oscillations have been associated with holding information in working memory.  Is it just a general increase in gamma or do gamma oscillations actually maintain and convey specific information?  A new study by Honkanen et al suggests that it does contain information.  The strength and topography of gamma oscillations reflected memorized visual features as well as the amount of information in working memory.

We’ve also shown that information about  two different objects can be carried in different phases of gamma band oscillations:
Siegel, M., Warden, M.R., and Miller, E.K. (2009) Phase-dependent neuronal coding of objects in short-term memory. Proceedings of the National Academy of Sciences, 106: 21341-21346. View PDF »
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About the Author

The Miller Lab uses experimental and theoretical approaches to study the neural basis of the high-level cognitive functions that underlie complex goal-directed behavior.