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MAP20071019450Waersted, M.The Effect of motivation on shoulder-muscle tension in attention demanding tasks / M. Waersted, R.A. Bjorklund, and R.H. WestgaardSumario: This paper evaluates motivation as a task-related factor causing the development of psychologically mediated shoulder-muscle tension. In four separate experiments using a visual display unit based complex reactiontime task, motivation was established by means of continuous feedback on the level of performance or by means of a money reward for good performance. In all experiments motivation improved the performance, but an increase in the psychogenic shoulder-muscle tension was only observed in the money-reward conditionEn: Ergonomics. - London and Washington. - Vol. 37, nº 2, February 1994 ; p. 363-3761. Ergonomía. 2. Biomecánica. 3. Fuerza muscular. 4. Extremidades superiores. 5. Motivación. I. Björklund, R.A.. II. Westgaard, R.H.. III. Título. IV. Título: Ergonomics.