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Journal of Neuroscience, Vol 14, 1634-1645, Copyright © 1994 by Society for Neuroscience
Hebbian synapses in visual cortex
A Kirkwood and MF Bear
Brown University Department of Neuroscience, Providence, Rhode Island 02912.
We discovered in slices of rat visual cortex that reliable long-term
potentiation (LTP) of synaptic responses in layer III could be elicited by
theta burst stimulation delivered to a site in the middle of the cortical
thickness, corresponding mainly to layer IV. This synaptic plasticity was
reflected in the extracellular field potentials and intracellular EPSPs in
layer III, but was not observed in the intracellular responses of layer V
neurons, suggesting a preferential involvement of synapses on layer III
neurons. Tetanus-induced LTP in this preparation was input specific, and
was blocked by application of an NMDA receptor antagonist (but not by an
antagonist of nitric oxide synthase). In addition, LTP of layer IV-evoked
responses could also be produced reliably by pairing low-frequency synaptic
stimulation (approximately 100 pulses at 1 Hz) with strong intracellular
depolarization of layer III neurons. Thus, LTP in this circuit satisfies
the definition of a "Hebbian" modification. Tetanic stimulation of the
white matter, in sharp contrast, consistently failed to elicit LTP in layer
III unless a GABAA receptor antagonist was applied to the slice. Analysis
indicated that the critical difference between layer IV and white matter
stimulation was not the magnitude of the responses to single stimuli
delivered to the two sites, but that it might lie in the postsynaptic
response during high-frequency stimulation. Consistent with this idea,
"associative" LTP could be elicited from white matter when converging but
independent inputs from the white matter and layer IV simultaneously
received tetanic conditioning stimulation. A hypothetical model is
presented to account for the differences between layer IV and white matter
stimulation. According to this "plasticity gate hypothesis," inhibitory
circuitry in layer IV normally acts as a sort of band-pass filter that
constrains the types of activity patterns that can gain access to the
modifiable synapses in layer III. By stimulating in layer IV, we have
bypassed this filter and therefore do not need to block GABAA receptors to
achieve the threshold for LTP in layer III.
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