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Biomedical subjects

W F Daniel

Publications and source records attributed to W F Daniel.

12 recordsLinked to original sources
PubMed1987

Neuropsychological aspects of disorientation.

Patients were asked twelve orientation questions before ECT and during the recovery period (the postictal confusional state) following ECT. Disorientation was more severe in the elderly. The different orientation items did not recover simultaneously; different recovery times may enable patients to give responses that are logical contradictions. While certain models (e.g., "person" versus "place" versus "time") may be useful in describing the differential recovery of orientation items, other models based on memory will probably prove more useful in delineating what causes this differential recovery. Patients gave responses to age and current year that were displaced backwards in years from the correct response. It is suggested that this displacement represents retrograde amnesia. As the postictal confusional state cleared, however, these backwardly displaced responses decreased in years of remoteness, thus showing a pattern of "shrinkage" that is similar to shrinking retrograde amnesia following head-injury. It is suggested that this result supports Ribot's law of regression.

Age Factors↗
PubMed1987

Length of retrograde amnesia after head injury: a revised formula.

Our earlier retrospective study presented a formula relating lengths of retrograde amnesia to length of post-traumatic amnesia (PTA) and length of time since injury (Crovitz, Horn and Daniel, 1983). The earlier study derived the formula from 27 cases with retrograde amnesia. The present study adds another 75 cases, and we discuss similarities and differences between the two samples.

Adult↗
PubMed1984

Everyday forgetting experiences: real-time investigations with implications for the study of memory management in brain-damaged patients.

In order to attempt to measure everyday forgetting experiences outside the laboratory, groups of undergraduates, healthy old people, and neuropathological patients with memory complaints were asked to use portable memory diaries. For a period of 7 days, they were immediately to write down every instance of noticing that they had forgotten anything. Types of forgetting, their frequency, and types of cues in the world that served as reminders that forgetting had occurred are discussed.

Adult↗
PubMed1984

Perceptual learning with right unilateral versus bilateral electroconvulsive therapy.

Perceptual learning was examined with respect to variations in ECT electrode placement (bilateral versus right unilateral) and ECT stimulus waveform (sinusoidal versus brief-pulse). While patients receiving right unilateral ECT demonstrated more perceptual learning than did those receiving bilateral ECT, no difference in perceptual learning resulted from the variation in electrical stimulus waveform. Furthermore, the amount of perceptual learning was unaffected by EEG seizure duration and by the total amount of electrical stimulus energy delivered. The theoretical issue of whether an electrical or a seizure difference between bilateral and right unilateral ECT is responsible for inter-group learning or memory differences is discussed, as well as practical issues related to the choice of electrode placement.

Adult↗