W O Shaffer

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Simultaneous attention to 49 spatial positions resulted in the processing of threshold information from one of those positions essentially identical to the processing when the subject knew in advance that that position would be tested. This result held true when the task consisted of detection of the presence of a briefly presented dot. The same result held(More)
An experimental model of the L4-L5 lumbar motion segment was developed that allowed precise manipulation of sagittal translation, rotation of L5 relative to L4, tilt of L4 on L5, and control of roentgenogram quality (image clarity) by placing a water bath between the tube and the vertebral body. A series of experiments were designed to systematically assess(More)
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