As there were no specific hypotheses regarding sex differences, and given the resulting small cell sizes for AH, gender was excluded from all analyses (all reported effects were preserved in secondary analyses including gender). Group differences in accuracy or N1 sink amplitude were examined using planned contrasts (BMDP-4V; Dixon, 1992). All reported correlations coefficients are linear (Pearson). A conventional significance level (p < .05) was applied for all effects. Effect sizes (partial eta squared [η2p]) are reported for group main effects.
