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Table 1 Relationships between perceived mental effort and physiological parameters measured during the three attentional tasks.

From: Perceived mental effort correlates with changes in tonic arousal during attentional tasks

   Continuous Performance Task Go/No-Go Task Cued Target Detection Task
   Spearman p-value Spearman p-value Spearman p-value
Left frontal (F3) relative θ (4-7 Hz) power   -0.09 0.533 * -0.37 0.011 ** -0.33 0.024
  relative α (7-13 Hz) power   -0.08 0.588   0.21 0.16   0.11 0.47
  relative β (13-30 Hz) power   0.08 0.59   0.24 0.115 * 0.39 0.008
  θ/β ratio   -0.11 0.461 ** -0.31 0.035 * -0.37 0.011
Right frontal (F4) relative θ (4-7 Hz) power   0.11 0.454   -0.21 0.166 ** -0.34 0.021
  relative α (7-13 Hz) power   -0.1 0.523   0.1 0.522   -0.02 0.912
  relative β (13-30 Hz) power   -0.06 0.696   0.25 0.092 * 0.48 0.001
  θ/β ratio   0.06 0.699   -0.27 0.074 * -0.43 0.003
Left parietal (P3) relative θ (4-7 Hz) power   0.04 0.795   -0.16 0.275   -0.18 0.232
  relative α (7-13 Hz) power   -0.27 0.065   0.01 0.949   -0.03 0.819
  relative β (13-30 Hz) power ** 0.29 0.047 * 0.38 0.009 * 0.4 0.006
  θ/β ratio   -0.18 0.237 * -0.37 0.011 * -0.38 0.009
Right parietal (P4) relative θ (4-7 Hz) power   0.01 0.936   -0.17 0.258   -0.23 0.126
  relative α (7-13 Hz) power   -0.22 0.143   -0.01 0.944   0.13 0.399
  relative β (13-30 Hz) power   0.18 0.221 * 0.37 0.01   0.21 0.157
  θ/β ratio   -0.14 0.35 * -0.36 0.015   -0.25 0.097
P300 latency Left parietal (P3)   -0.04 0.776   -0.13 0.403   0.01 0.966
  Right parietal (P4)   -0.1 0.504   -0.09 0.564   -0.08 0.579
  Left parietal (P3) for no-go trials      0.01 0.939    
  Right parietal (P4) for no-go trials      0.08 0.616    
P300 amplitude Left parietal (P3)   0.12 0.422   -0.02 0.886   -0.05 0.725
  Right parietal (P4)   0.16 0.286   0.02 0.916   -0.05 0.753
  Left parietal (P3) for no-go trials      0.13 0.395    
  Right parietal (P4) for no-go trials      0.02 0.88    
Response time    -0.04 0.779   0.04 0.773   -0.07 0.624
Errors of inhibition made during no-go conditions      0.11 0.478    
Number of skin conductance responses   -0.17 0.249   -0.02 0.907   0.01 0.946
Duration of skin conductance responses   -0.13 0.387   -0.01 0.947   -0.12 0.436
Heart Rate    -0.08 0.608   0.11 0.454   0.01 0.972
Heart rate variance low frequency (0.04-0.15 Hz)   0.12 0.447   0.26 0.085   0.17 0.248
Heart rate variance high frequency(0.15-0.4 Hz)   0.03 0.819 ** -0.32 0.03   -0.24 0.101
Heart rate variance LF/HF   0.07 0.647 ** 0.34 0.022   0.25 0.09
  1. Spearman's rank order correlations between physiological parameters and perceived mental effort during each of the three attentional tasks: continuous performance task, go/no-go task, and the cued target detection task (** p < 0.05, * p < 0.01667, n = 46).