Exploratory individual differences analysis
Additional exploratory analyses were conducted to examine whether
individual differences between participants explains the magnitude of
alcohol induced effects within the Oddball and Regularity tasks, and
whether any chance differences between samples could explain differences
between tasks.
For this analysis, we computed the magnitude of alcohol induced
change for each variable. For instance, P1 peak was measured in alcohol
and placebo conditions, and the difference between these is the alcohol
induced P1 effect.
For each participant, we measured alcohol-induced changes to P1 peak, N1
drop, P300, SPN, behavioural performance, light-headedness, and
alertness. For this analysis, the SPN was defined averaged over early
and late windows. We also computed gap between sessions, AUDIT score and
age. Correlations between these 10 variables were assessed within
Oddball and Regularity tasks separately. Light-headedness and alertness
scores were averaged over the final pre-experiment rating and post
experiment rating.