Exclusion criteria.
Cells were excluded from experiments when i) their resting membrane
potential (Vrest) was above -50 mV, ii) the membrane resistance was
higher than 1000 MΩ, and iii) no AP could be elicited in the no light
condition. Traces were excluded from the analysis when: i) the starting
Vm (calculated in the 100 ms preceding the depolarizing current step) in
the no light condition differed by more than 5 mV from the starting Vm
in the light condition, ii) there was an instability in membrane
potential, and iii) a degradation of neuronal whole-cell recording
(depolarization of resting potential > 10 mV, AP overshot
below 0mV, or access resistance > 60 mΩ 11Revised
from initial proposal of access resistance > 40 mΩ, after
editorial approval on 13 Sept 2021. Analysis using 40 mΩ criteria lead
to qualitatively similar results that are available at
https://osf.io/amvkq).
Competing Interests: the authors declare no competing financial
interests.