SOURCES OF P300 ATTENUATION AFTER HEAD-INJURY - SINGLE-TRIAL AMPLITUDE, LATENCY JITTER, AND EEG POWER

Single trial amplitude, latency jitter, and electroencephalographic (E EG) power were examined as sources of the group difference in averaged P300 amplitude among 15 traumatically brain injured and 20 control in dividuals in an auditory oddball paradigm. Mean amplitude of the indiv idual trials was highly correlated with the amplitude of the averaged P300, with little additional unique variance attributable to latency j itter or EEC power. The group difference in P300 amplitude was also ex plained by the mean amplitude of the single trials. These results supp ort the robustness of the event-related potential averaging technique within the paradigm used.