Table 2.
Means and standard deviations for physiological responses by stimulus level and task condition, and task performance.
| Measure | Stimulus level |
Task condition |
||||
|---|---|---|---|---|---|---|
| Low | Medium | High | No Task | Easy Task |
Hard Task |
|
| SEP (µVolts) | 13.49 a (22.05) | 23.86 a (25.04) | 33.01 a (27.44) | 25.58b (26.79) | 21.50b (25.82) | 21.15b (24.95) |
| PDR (mm) | 0.053 a (0.30) | 0.117 a (0.31) | 0.239 a (0.37) | 0.140 (0.34) | 0.136 (0.34) | 0.130 (0.34) |
| SCR (mMhos) | 0.223 a (0.34) | 0.293 a (0.39) | 0.466 a (0.48) | 0.294 (0.41) | 0.396 (0.44) | 0.381 (0.44) |
| Task Performance | ||||||
| Response Time (ms) | 555 c (0.08) | 573 c (0.09) | ||||
| Accuracy (%) | 90.5 c 13.6) | 86.9 c (13.9) | ||||
a
Main effects for stimulus level p<0.0005
b
Main effect for task condition p<0.0005
c
Main effect for task condition p<0.01
Abbreviations: SEP = stimulus evoked potential; PDR = pupil dilation response; SCR = skin conductance response.