Evidence for effects of task difficulty but not learning on neurophysiological variables associated with effort

• Published in: International journal of psychophysiology 2014-08, Vol.93 (2), p.242-252
• Main Authors: Brouwer, Anne-Marie, Hogervorst, Maarten A., Holewijn, Michael, van Erp, Jan B.F.
• Format: Article
• Language: English
• Subjects: Adult; Analysis of Variance; Behavioral psychophysiology; Biological and medical sciences; Brain Waves - physiology; EEG; effort; Electrocardiography; Electroencephalography; eye; Female; Fundamental and applied biological sciences. Psychology; Galvanic Skin Response - physiology; Heart Rate - physiology; Humans; learning; Learning - physiology; Male; Physical Stimulation; physiology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Psychomotor Performance; Reaction Time - physiology; Workload; Young Adult
• ISSN: 0167-8760; 1872-7697
• DOI: 10.1016/j.ijpsycho.2014.05.004

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. •We examine effects of task difficulty and learning on physiology.•We control for the amount of body movements, sensory input and general time effects.•Effort as affected by task difficulty and learning seem to be different concepts from a physiological perspective.•We give an overview of the sensitivity of physiological variables to task difficulty and time.