14, 2010- 3:30 p.m. Location: Fields
Bard Ermentrout, University of Pittsburgh Double or Nothing: The Blinking Brain
In this talk, I discuss two
kinds of visual phenomena that are produced by periodically
forcing the visual system. In both cases, spatiotemporal
patterns are generated by nonlinear interactions
of the stimulus with the underlying dynamics of
the visual system. Period doubling bifurcations
lead to slowly modulated bistability in one case
and spontaneous symmetry breaking in the other.
Normal form analysis allows us to also explain why
some patternsare seen at low frequencies while others
are seen at high strobe frequencies.The talk will
be accessible to graduate students.