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Fig. 6. Quantification of the negative image response as a function of baseline
input rate re. (A,B) Phase histograms were quantified in
terms of the preferred phase (A) and the vector strength (B). Each panel shows
the results for both model (Fo=0.05 in black,
Fo=0.2 in gray) and experiment
(Fo=0.05, open symbols; mean ± s.d., N=5
neurons). As indicated, a positive preferred phase represents an in-phase
response and a negative preferred phase represents an out-of-phase response
(i.e. negative image). (C) Similar to Fig.
4E, the firing rate response of the LIF model is shown for
Fo=0.05 (black) and Fo=0.2 (gray).
Also indicated are the regions of re in which the
preferred phases are positive and negative (plus-image and minus-image
respectively). Note that this corresponds to the sign of the slope of the
non-monotonic response curve. Also note that for intermediate values of
re the responses depend on Fo and are
characterized by preferred phases of either sign and relatively low vector
strength.