Auditory recovery function and P3 in boys at high risk for alcoholism

We have previously reported P3 decrements in boys at risk for alcoholism in a complex visual rotation reaction time task. The present study investigated the generalizability of these observations by studying a new high risk sample of boys of Type 2 alcoholic fathers under different experimental conditions. The current experimental design consisted of an easy auditory oddball task (P3) which stressed accuracy over speed of responding, and which also included variable interstimulus intervals (0.5, 1.0 and 5.0 sec), allowing recovery functions to be derived from the evoked responses to frequent non-target stimuli. The results did not yield statistically significant differences between groups in the recovery function data. However the baseline-to-peak results to the target stimulus indicated significant decreases in both P2 and P3 amplitudes in the high risk boys. No differences in latency were obtained between groups. Furthermore frequency analysis of responses to the target stimulus using a multivariate time series model indicated between-group differences at 4 frequencies (1.43, 7.14, 8.6 and 11.43 Hz). These results replicate our previous findings of P3 decrements in boys at risk for alcoholism in a new sample of sons of Type 2 alcoholics. As we have now made these observations with different experimental conditions and sensory modalities, it is suggested that these findings are generalizable.