Gamma Hypothesis

I would like to offer for detailed scrutiny a hypothesis respecting the nature and spectrum of the gamma rhythm.

The foveal region of the retina is capable of much higher resolution than the rest of the retina.
That the fovea’s greater spacial resolution is matched by greater temporal resolution.

Evoked response/FFR over the visual and auditory cortices at up to 100Hz has been recorded. Noticeable improvement is observed when changing a monitor from 100Hz refresh to 120Hz refresh.

Most people have a flicker fusion frequency of around 35 frames per second. This would suggest that for normal operation, visual data can be analysed at a frequency of 35Hz. 35Hz would thus seem a reasonable upper end for the “normally engaged” beta state.

From the abovementioned assumptions, would it then be reasonable to suggest that high precision, high detail work might be conducted in the foveal field at refresh rates greater than the standard flicker fusion rate? Would it thus be appropriate to consider gamma rhythms to be associated with activity based on stimulation at rates within the resolution of the foveal region. Could it further be considered that events occurring in the foveal region at gamma rates (up to 100Hz) may be uniquely recognised.

My sincere apologies if this has been previously expressed elsewhere – references please.

Copyright (C) 2009 Craig Tice


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