Biomedical subjects
Publications and source records attributed to P Tynan.
Nine cases of vesicovaginal fistula which followed hysterectomy, with or without radiotherapy, are presented. The repair by the above-mentioned technique eventually led to successful closure in all cases. A strong argument can now be advanced that this is the technique of choice in the large, high postoperative type of vesicovaginal fistula which is now the common type of fistula seen in affluent countries.
We have developed a reliable and valid procedure for determining a person's contrast sensitivity function in approximately 6 min. This rapid procedure, which resembles that used in the Bekesy sweep-frequency audiometer, has potential as a clinical tool for diagnostic assessment.
Moving contours surrounding an empty region make phantoms appear to move through the empty region. The phantoms are contours, dimmer than the inducing contours but of the same pattern, color, speed, and direction of movement. The phantoms originate in the brain and may be related to completion effects most often seen with visual pathology.
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Brief visutal stimuli presented in rapid sequience, one to the left and one to the right, appear to occur left first, then right, regardless of the actual order of presentation. This illutsion persists under conditions of forced-choice testing and does not vary with presemitation to the same or opposite retinal hemifields, A series of experiments suggests that this illutsion may be the product of an internal mechanism that scans visual inputs in a left-to-right order.