[Effects of task load level and input modality format on P3 wave of event related brain potential]

With different task load levels and input modality formats, P3 wave of event related brain potential (ER-P) were recorded and analyzed in eighteen healthy young man performing six dual tasks. The dual task was made up of visual tracking primary task (T) and Sternberg additional task (S) or Oddball additional task (O) (TS and TO). Its difficulty was controlled by changing the velocity and dimension of movement of target in primary task. The results showed that P3 latency (LAT) prolonged when the primary task was more difficult and its changes of amplitude(AMP) depended on the input modality formats of primary task and additional task. AMP of TO dual task with different formats decreased when the primary task was more difficult and that of TS with same formats increased. It suggests that task load level and input modality format may influent P3 wave of event related brain potential.