Biomedical subjects
W J Zinn
Publications and source records attributed to W J Zinn.
Dynamic stereoacuity: a test for hitting a baseball?
Vision is a critical ingredient in professional sports such as baseball. It would, therefore, be logical to assume that vision testing should be able to discriminate between good and bad performance. Past attempts to establish this vision/performance relationship have not been successful. We believe the fault is anchored in the fact that all routine vision testing is static and unable to measure motion parameters. Using an instrument of our design to test dynamic stereoacuity, we have been able to detect subtle differences among individuals. The data show a segregation between major league hitters and pitchers. Such information could be used as one clue to predict hitting performance.
A comparison of static and dynamic stereoacuity.
It is usually assumed by the clinician that a person's total stereoscopic ability can be measured by routine stereoacuity tests. Yet, there is considerable evidence that the brain processes static and moving images via separate channels. In an attempt to determine the validity of the clinician's assumption, we compared results of the Titmus and TNO stereoacuity test with that of a dynamic stereoacuity test of our design. The data obtained from 146 subjects showed no correlation between static and dynamic responses. It seems improbable, therefore, that stereoscopic ability in the real world can be predicted from static clinical stereoacuity tests. The implication of dynamic stereopsis in sports vision and athletic performance is discussed.
Supraventricular tachycardia with ventricular aberration.
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Hypothermia in the critical-care unit.
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