Data analysis and statistics:
For each of the ten patterns, the hypotheses tested were:
Hypothesis 1 : patterned light stimulation is responsible for a decrease in AP amplitude.
Hypothesis 2 : patterned light stimulation is responsible for an increase in AP latency.
Hypothesis 3 : patterned light stimulation is responsible for the generation of an outward current.
Hypothesis 4: patterned light stimulation is responsible for a decrease in the average firing frequency.
The sample sizes required to have a statistical power > 90 % were estimated based on the Cohen’d effect size observed in Ait Ouares et al. (2019) (ES = mean of light effect /standard deviation of light effect).