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synchronization without oscillations

HARRY R. ERWIN herwin at osf1.gmu.edu
Thu Jul 27 07:58:10 EST 1995


Darragh Smyth (smyth at zorro) wrote:
: Recent studies my Konig et al (1995) suggest that over short-distances < 2mm
: in visual cortex, synchronization of firing between neurons is not necessarily
: accompanied by the usual oscillations that occur with synch over longer
: distances. However, all the models that I have seen for explaining zero-phase
: lag synch in time-delay systems use the oscillations to induce synchrony. Does
: anyone know of anyone computational models that can synchronize without using
: the oscillations? In otherwords they synch inside one period of firing. It
: sounds like a chicken and egg problem but the biology seems to solve it in
: some way! Any ideas?

I call this flash synchronization, and it is seen in Freeman's models and
data. Skinner has relevant data as well. Leslie Kay may have developed a
way of efficiently recognizing it in vivo. Bernard Doyon's papers address
the underlying dynamics, and I intend to look at it in my dissertation. 

BTW, the oscillations are generated by the inherent dynamics of metabotropic 
glutamate synapses (Hayashi) and seem to be an endogenous process that is 
modulated by dynamic interactions in the dendritic tree. 

--
Harry Erwin
Internet: herwin at gmu.edu 
Home Page: http://osf1.gmu.edu/~herwin (try a couple of times)
PhD student in comp neurosci: "Glitches happen" & "Meaning is emotional"



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