Newspapers tended to overrepresent support for screening mammography for women aged 40 to 49 years. Reports would have been improved by identification of all sources for information cited, less reliance on relatively few sources, and discussion of benefits in absolute as well as relative terms. Medical journalism may benefit from identification of standards similar to those used for reporting medical research.
Visual, auditory, and proprioceptive feedback were studied as sources of response-produced feedback on acquisition trials with knowledge of results (KR) and on trials where KR was withdrawn. The experimental design had eight groups where feedback was either augmented or minimal and either the same or different from acquisition to KR withdrawal, and amount of practice in acquisition was either high or low. A linear self-paced positioning task was used. Performance in acquisition was best when feedback was augmented. Performance was best in the KR withdrawal trials when feedback was augmented throughout and when amount of practice in acquisition was high, and worse when the conditions of feedback had been changed. The results were interpreted as negative for K. S. Lashley's hypothesis of motor programming and a hypothesis of feedback as a performance rather than a learning variable, and positive for J. A. Adams's 1971 closed-loop theory of motor learning.
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