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Biomedical subjects

L W Poon

Publications and source records attributed to L W Poon.

7 recordsLinked to original sources
PubMed1979

A questionnaire assessment of age differences in retention of recent and remote events.

Age-related differences in memory for recently and remotely dated events have been evaluated through questionnaire assessment. Results from previous studies employing the technique differ in the analysis of retrieval of recent and remote events. In attempting to reconcile extant results from the literature, the following study employed a group of healthy males ranging in age from 26 to 69. The results showed: 1. The elderly exhibited no impairment of the ability to remember recent colloquial events. 2. The elderly's surprisingly accurate recall of remote events was not a product of selective and frequent rehearsal.

Adult↗
PubMed1978

Toward applying cognitive skill training to memory problems.

Four elements of a successful program of cognitive skill training for the elderly include: (a) the use of mnemonic aids for the memorization of new information; (b) the development of motivational techniques to enhance attention to materials and maintenance of cognitive skills acquired through training; (c) the design of techniques which utilize individual differences in abilities, personality, and cognitive style to enhance individual programs of cognitive skill training; and (d) the use of appropriate medical and/or psychiatric care when necessary.

Aged↗
PubMed1978

Speed of retrieval from long-term memory in relation to age, familiarity, and datedness of information.

The time required to name four groups of pictures was measured in 83 community dwelling males (18-70 years of age). One group consisted of objects used 50 to 70 years ago (unique dated exemplars), and another consisted of objects unique to contemporary times (unique contemporary exemplars). For comparison, other pictures of contemporary and dated objects commonly used in both periods were employed. There were three major findings. One, the familiarity of the pictured object is the major determinant of the time required to retrieve its name. Older subjects named the dated unique objects that were relatively more familiar to them more rapidly than did younger adults, while the reverse was true for contemporary unique objects. No age difference in the speed of naming common contemporary objects was found. Two, the overall age-related difference in naming latency was attributed to perceptual-motor aspects of the task. Three, the physical features as well as the familiarity of the object contributed to the speed of retrieval of the object's name.

Adolescent↗
PubMed1975

Changes in alpha rhythm asymmetry during learning of verbal and visuospatial tasks.

Alpha activity in the two cortical hemispheres was examined during learning and overlearning of a verbal and a visuospatial task. Compared to a pretask baseline condition, the amount of alpha activity during the tasks was decreased. An increase in alpha activity was found from learning to overlearning in both tasks. A greater amount of alpha was found in the right hemisphere for both tasks. In addition, no difference in the degree of alpha asymmetry was found between the tasks. This was discussed in light of prior contrary findings. A significant positive correlation was found between change in learning rate and change in alpha asymmetry during the verbal task. An interpretation of this finding was offered in terms of the level of hemispheric activation reflecting the degree of task engagement.

Alpha Rhythm↗
PubMedDate not supplied

Locus of control and vasomotor response to sensory processing.

Heart rate and forearm blood flow responses were measured during experimental tasks requiring sensory intake, sensory rejection, and a mixture of the two behaviors. Subjects were 29 college students who had been categorized using Rotter's locus of control scale. Significant increases in both cardiovascular indices were seen in all three tasks; the responses were smaller, however, during sensory intake. Internals showed a differential response of forearm blood flow. In contrast, externals showed a similar vasodiatation across all tasks. The findings indicate that some of the variability in cariovascular response to sensory processing may be explained by individual differences in personality charcteristics related to subjects' perferred level of involvement in differing sensory processing behaviors.

Attention↗