Extended Data Fig. 4: Stimulus-independent activity does not affect the measured eigenspectrum.
From: High-dimensional geometry of population responses in visual cortex
a, To measure the effects of correlated noise variability on eigenspectra estimated by cvPCA, we examined the effect of projecting out different numbers of noise dimensions (estimated during periods of spontaneous grey-screen) from the responses in an example experiment. b, The same analysis as in a, averaged over all recordings. The presence of these noise dimensions made little difference to the estimated signal eigenspectrum other than to slightly reduce estimated eigenvalues in the highest and lowest dimensions. For the main analyses, 32 spontaneous dimensions were subtracted.
