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Fig. 5. Stimulus reconstruction and coherence measurements. (A) A 500 ms recording
of 10–200 Hz band-passed Gaussian White Noise (GWN; r.m.s.=73 mm
s–1) stimulation (lower panel) and elicited response (upper
panel) in a right 10-2a interneuron (same cell as in
Fig. 3). (B) Linear kernel
obtained from a full 100 s of simultaneously recorded stimulus and response
data. (C) Stimulus from A (black) and best linear estimate obtained from
stimulus reconstruction using kernel in B (broken blue line). The upper panel
shows the full stimulus and stimulus estimate; the lower panel shows both
after low-pass filtering below 50 Hz. (D) Upper panel: stimulus–response
coherence mean (black line) ±1 s.d. (gray background), calculated over
10 repeats of stimulus. Lower panel: power spectra of stimulus (upper and
lower panels calculated from data in A). (E) Stimulus reconstruction using
kernel from B on a test data set where the stimulus was drawn from the same
statistical distribution as the stimulus in A (upper and lower panels same
convention as in C). (F) Simultaneous recording for 500 ms of R10-2a (blue,
not the same cell as A) and L10-3a (green) in response to a 10–300 Hz
band-passed GWN stimulus (lower trace, r.m.s.=43 mm s–1). (G)
Estimated reconstruction of stimulus in F using combined kernel from R10-2a
and L10-3a (upper and lower panels same convention as in C and E). (H) Upper
panel: coherence curves from data in F obtained using only cell R10-2a (blue),
only cell L10-3a (green), and both cells together as a functional unit (red).
Lower panel: power spectrum of stimulus from F.
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