External attentional focus enhances movement automatization: A comprehensive test of the constrained action hypothesis

• Published in: Human movement science Vol. 32; no. 4; pp. 527 - 539
• Main Authors: Kal, E.C., van der Kamp, J., Houdijk, H.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.08.2013
• Subjects: Adult; Attention - physiology; Automatism - physiopathology; Electromyography; Female; Focus of attention; Functional Laterality - physiology; Human performance; Humans; Internal-External Control; Kinematic analysis; Male; Motor control; Motor Skills - physiology; Movement - physiology; Muscle, Skeletal - physiopathology; Psychomotor Performance - physiology; Young Adult; 234; Focus of attention; Human performance; 2343; 2330; Kinematic analysis; Motor control
• ISSN: 0167-9457; 1872-7646
• DOI: 10.1016/j.humov.2013.04.001

•The effect of attentional focus on movement automatization was investigated.•We assessed automaticity with dual task costs, EMG activity, jerk, and sample entropy.•An external focus resulted in superior motor performance than an internal focus.•Focusing attention externally was found to enhance automatization of movement.•These results were in line with the predictions of the constrained action hypothesis. An external focus of attention has been shown to result in superior motor performance compared to an internal focus of attention. This study investigated whether this is due to enhanced levels of movement automatization, as predicted by the constrained action hypothesis (McNevin, Shea, & Wulf, 2003). Thirty healthy participants performed a cyclic one-leg extension-flexion task with both the dominant and non-dominant leg. Focus of attention was manipulated via instructions. The degree of automatization of movement was assessed by measuring dual task costs as well as movement execution parameters (i.e., EMG activity, movement fluency, and movement regularity). Results revealed that an external focus of attention led to significantly better motor performance (i.e., shorter movement duration) than an internal focus. Although dual task costs of the motor task did not differ as a function of attentional focus, cognitive dual task costs were significantly higher when attention was directed internally. An external focus of attention resulted in more fluent and more regular movement execution than an internal focus, whereas no differences were found concerning muscular activity. These results indicate that an external focus of attention results in more automatized movements than an internal focus and, therefore, provide support for the constrained action hypothesis.