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Biomedical subjects

D Gans

Publications and source records attributed to D Gans.

8 recordsLinked to original sources

Elder abuse by adult children: an applied ecological framework for understanding contextual risk factors and the intergenerational character of quality of life.

Elder abuse in family settings has increased in recent years for a variety of reasons, including the increasing proportion of older adults in the total population, the related increase in chronic disabling diseases, and the increasing involvement of families in caregiving relationships with elders. Future trends indicate not only continued growth of the older population but suggest, as well, an increased demand for family caregiving which may, in turn, be accompanied by increasing rates of elder abuse. It is important to consider issues associated with such caregiving and elder abuse in families from an ecological perspective as a basis both for framing conceptually relevant and effective prevention strategies as well as for understanding the specific character of the broader issue of the intergenerational nature of the quality of life in an aging society. Using an applied ecological model, the article focuses on the contextual risk factors of elder abuse. Specifically, five levels of environment--microsystem, mesosystem, exosystem, macrosystem, and chronosystem--will be utilized to organize and interpret existing research on the risk factors asociated with elder abuse (Bronfenbrenner, 1979, 1986, 1997). The configuration of the risk factors provides a useful framework for understanding the intergenerational character of the quality of life for older adults, for developing recommendations for empirically-based action research, and for the development of community-based prevention and intervention strategies. The application of a contextual perspective to the development of intervention and prevention programs will be addressed, the latter in relation to primary, secondary, and tertiary prevention.

Adult↗

Hearing aid effect in older females.

Surveys have revealed that nonusers of hearing aids frequently hold negative perceptions of hearing aid users (the "hearing aid effect"). This study involved the use of both objective and subjective approaches in measuring the perceptions of older females toward hearing aid wearers. Twenty older females rated an aided and unaided peer after reading to them. Between-group differences were insignificant for objective measures (vocal intensity, reading time) and two subjective measures (age, attractiveness). However, the older females perceived their aided peers significantly more negatively than their unaided peers on measures of confidence, intelligence, and friendliness. This negative perception also surfaced in females who were unaware of the hearing aids, suggesting that a negative self-image by hearing aid wearers may contribute to the hearing aid effect.

Adult↗

Development of a hearing test protocol for profoundly involved multi-handicapped children.

The purpose of the present study was to develop a protocol for use in testing the hearing of profoundly involved multi-handicapped children. Behavioral observation audiometry, visual reinforcement audiometry, auditory brain stem response (ABR), and noise-tone-difference tests were administered to 156 children with multiple handicaps. Eighty-three percent of the children with normal middle ear function were estimated to have normal hearing or, at worst, a mild hearing loss, by one or more of the tests. ABR was the single best test, followed by behavioral observation audiometry and noise-tone-difference. However, only 65% of the children would have passed had they only been tested with ABR. If agreement among two of the tests had been required, hearing loss would have been ruled out in only 34% of the children. A factor analysis revealed that the various hearing tests were associated with different medical and physical conditions which might influence threshold estimation for multi-handicapped children. These results support use of a series-positive test battery protocol in which individual tests are used sequentially with the purpose of ruling out moderate-profound sensorineural hearing loss.

Acoustic Stimulation↗

Bias in scoring auditory brainstem responses.

ABR waveforms from 50 multi-handicapped children were analysed by nine judges in an investigation of scoring bias. Prior to estimating threshold for each subject, the judges were provided with either true or false ABR thresholds. This preliminary information was true in 25 of the cases and false in the other 25. The same ABR waveforms were evaluated one week later, but true/false biasing thresholds were reversed. Results revealed that while the more experienced judges were more accurate in their assessments, they were not necessarily less biased. The effects of bias were more predominant in those cases where the estimation of threshold was the most difficult.

Acoustic Stimulation↗

Biasing of the summating potentials.

Summating potentials (SP) were recorded in the guinea pig cochlea, utilizing the differential-electrode technique. The effects of biasing the cochlear partition of the SP were observed under three different conditions: 1. electrical biasing--direct current polarization: 2. stimulus biasing--mechanical bias induced by low frequency sound stimulation, 3. COCB biasing--electrical stimulation of the crossed olivo-cochlear bundle. All three forms of biasing were found to have similar ellects on the SP which can be described in terms of the "absolute direction of change" in the potential. Under negative current (scala vestibuli negative; scala tympani positive), the negative phase of the stimulus bias (deflection of the cochlear partition towards scala vestibuli), or stimulation of the COCB, the SP is made more positive or less negative, as the case may be. In other words, the negative component of the differentially recorded SP is depressed, wheras the positive component is enhanced. The dominant influence os all three forms of biasing appears to be on mechanoelectric distortion arising in the hair-cell transduction process.

Acoustic Stimulation↗

Auditory-evoked response morphology in profoundly-involved multi-handicapped children: comparisons with normal infants and children.

The developmental and difference/defect theories have been used to explain auditory development in some multi-handicapped children. If developmental factors influence auditory response behaviors, it might be predicted that evoked potentials measured from the central auditory nervous system would reflect similar developmental influences in multi-handicapped children. The purpose of this study was to compare auditory-evoked-potential waveform morphology between profoundly-involved multi-handicapped children and normal infants and children. Auditory brainstem response (ABR) and middle-latency response (MLR) morphology were examined from waveform descriptions, wave detection, latency, amplitude, and spectral energy measures. The majority of handicapped subjects exhibited response morphology unlike that of normal children or infants. ABR/MLR morphology for handicapped children was characterized by depressed responses and substantial waveform variability. The results of this study tended to support the difference/defect theory.

Acoustic Impedance Tests↗