Evidence for effects of task difficulty but not learning on neurophysiological variables associated with effort.
Learning to master a task is expected to be accompanied by a decrease in effort during task execution. We examine the possibility to monitor learning using physiological measures that have been reported to reflect effort or workload. Thirty-five participants performed different difficulty levels of the n-back task while a range of physiological and performance measurements were recorded. In order to dissociate non-specific time-related effects from effects of learning, we used the easiest level as a baseline condition. This condition is expected to only reflect non-specific effects of time. Performance and subjective measures confirmed more learning for the difficult level than for the easy level. The difficulty levels affected physiological variables in the way as expected, therewith showing their sensitivity. However, while most of the physiological variables were also affected by time, time-related effects were generally the same for the easy and the difficult level. Thus, in a well-controlled experiment that enabled the dissociation of general time effects from learning we did not find physiological variables to indicate decreasing effort associated with learning. Theoretical and practical implications are discussed.
TNO, P.O. Box 23, 3769 ZG Soesterberg, The Netherlands. Electronic address: anne-marie.brouwer@tno.nl.
Anne-Marie
AM
Brouwer
TNO, P.O. Box 23, 3769 ZG Soesterberg, The Netherlands. Electronic address: maarten.hogervorst@tno.nl.
Maarten A
MA
Hogervorst
TNO, P.O. Box 23, 3769 ZG Soesterberg, The Netherlands. Electronic address: michael.holewijn@tno.nl.
Michael
M
Holewijn
TNO, P.O. Box 23, 3769 ZG Soesterberg, The Netherlands. Electronic address: jan.vanerp@tno.nl.
Jan B F
JB
van Erp
D000328:Adult; D000704:Analysis of Variance; D058256:Brain Waves / Q000502:physiology*; D004562:Electrocardiography; D004569:Electroencephalography; D005260:Female; D005712:Galvanic Skin Response / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007858:Learning / Q000502:physiology*; D008297:Male; D010812:Physical Stimulation; D011597:Psychomotor Performance; D011930:Reaction Time / Q000502:physiology; D016526:Workload; D055815:Young Adult
EEG; effort; eye; learning; physiology; workload