To accommodate the slowest reversal rate, the gratings were presented for 750 ms on each trial. Control non-alcohol sessions were run for each of the temporal conditions. The averaged CSFs for the eight subjects in the alcohol and the placebo conditions are shown Figure 1. Because there were no significant differences between the rising and falling phases of BAL, these data were also pooled. We note also that there were marked individual differences, with some subjects showing small effects and others quite large deficits.
Sensitivity is calculated as the reciprocal of the contrast threshold.
A value greater than 1 corresponds to an alcohol-induced deficit. As in the first experiment, there was no significant difference between the rising and falling blood alcohol curves and the data presented in Figure 2 represent the average of the two post-alcohol runs. This Figure shows the effects of introducing temporal modulation. For the lower modulation rates the data are similar to those for stationary gratings, that is, a small decline in sensitivity following alcohol. The results of the first experiment are consistent with those of both Zulauf et al.