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K Withers

Publications and source records attributed to K Withers.

4 recordsLinked to original sources
PubMed1997

Applying bandwidth feedback scheduling to a golf shot.

Bandwidth knowledge of results (KR) involves the presentation of precise error KR only on those trials in which a preset criterion of accuracy is not met. When the criterion is met, only a general statement referring to this success is given. It has been shown that bandwidth KR increases movement consistency relative to 100% relative frequency KR (Lee & Carnahan, 1990). While this and other KR schedules have been successful in promoting motor learning, there has been no attempt to generalize this finding to a motor task requiring whole-body coordination. This study examined whether, by using information feedback suited to a complex task (Kernodle & Carlton, 1992), the findings relating to bandwidth feedback would transfer to such a task. Participants practiced a golf chipping task with either KR or error correcting transitional information, under 0, 5, or 10% bandwidth conditions. Participants in the 10% bandwidth condition who had received transitional information performed more consistently in retention than all other participants. This result provides support for the generalization of bandwidth feedback principles to complex tasks.

Adult↗
PubMed1994

Combining lithium and sodium valproate for bipolar disorder.

We report two cases of severe bipolar disorder in which there was a dramatic response to the combination of lithium and sodium valproate. Both patients had failed to respond to the respective monotherapies. These cases suggest that the combination of lithium and sodium valproate may be more effective than each of these drugs used alone. There is a clear need for controlled outcome studies of the common clinical practice of combining lithium and the anticonvulsants.

Bipolar Disorder↗
PubMed1981

The prevalence of Raynaud's syndrome in rheumatoid arthritis.

To test the validity of the putative association between Raynaud's syndrome and rheumatoid arthritis (RA) 277 patients with rheumatic disorders were questioned about cold-induced colour reactions in the extremities. The time to recover digital temperature after brief immersion in ice water was used to confirm the presence of Raynaud's syndrome. The prevalence of Raynaud's syndrome in the 148 patients with RA and the 59 patients with osteoarthritis was 2.7% and 5.1% respectively. It is concluded that Raynaud's syndrome is not a frequent accompaniment of RA, and it is suggested that in view of the close association between Raynaud's syndrome and certain other disorders, such as mixed connective tissue disease and scleroderma, when patients present with polysynovitis and Raynaud's syndrome special consideration should be given to these conditions.

Arthritis, Rheumatoid↗