| 摘要 |
The effects of mental fatigue on response processes were examined
using event-related brain potentials in this study. Twenty subjects were requested
to perform a 2-back task for 100 min continuously which was used as the
inducement of mental fatigue, meanwhile they were required to perform a 10-min
Go/NoGo task (pretest) before and after the 2-back task (posttest) respectively.
The subjective scores of fatigue scales, behavioral performance and electroen-
cephalogram were recorded during the whole experiment. Increased fatigue scale
scores and impaired performance demonstrated mental fatigue was indeed
induced. In ERP analysis, paired T-test was used to analyze Go/NoGo-P3,
Go/NoGO-N2 and ERN/Pe between the pretest and posttest and the results were
as follows: The amplitude of NOGO-P3 decreased significantly (P < 0.05), while
latencies of NOGO-P3/N2 and GO-P3 increased (all P < 0.05). Larger ERN
amplitude was evoked by erroneous response to NoGo trials (P < 0.05). These
results suggested that mental fatigue attenuated the response processes, and the
metrics above are possible indices for measuring mental fatigue. |