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Biomedical subjects

M Sommers

Publications and source records attributed to M Sommers.

7 recordsLinked to original sources
PubMed2000

Auditory habituation in young and older adults: the verbal transformation effect.

In 3 experiments, auditory massed repetition was used to examine age-related differences in habituation by means of the verbal transformation paradigm. Participants heard 10 words (5 high frequency and 5 low frequency), each presented 180 times, and they reported perceived changes in the repeated words (verbal transformations). In these experiments, older adults reported fewer illusory percepts than young adults. Older adults' loss of auditory acuity and slowing of processing, stimulus degradation (in young adults), and instructions biasing the report of these illusory percepts did not account for the fewer illusory percepts reported by the older adults. These findings suggest that older adults' reduced susceptibility to habituation arises from centrally located declines in the transmission of information within the word-recognition pathway. The discussion focuses on the implications that these age-related declines may have on word identification during on-line speech perception.

Adolescent↗
PubMed2000

Direct comparison of auditory implicit memory tests.

In this experiment, we examined the degree to which four implicit tests and two explicit tests, all involving auditory presentation, were sensitive to the perceptual characteristics of the stimuli presented during study. Presenting stimuli visually decreased priming in all the implicit memory tests, relative to auditory presentation. However, changing voice between study and test decreased priming only in the implicit memory tests requiring identification of words degraded by noise or by low-pass filtering, but not in those tests requiring generation from word portions (stems and fragments). Modality effects without voice effects were observed in cued recall, but the opposite pattern of results (voice effects without modality effects) was obtained in recognition. The primary new finding is the demonstration that auditory memory tests, both explicit and implicit, differ in their sensitivity to the perceptual information encoded during study.

Adult↗
PubMed1995

Representing refugees: the role of elites in Burundi refugee society.

Among Burundi refugees in Tanzania, men who have a university education and know English or French are most likely to represent their concerns to officials, particularly those from UNHCR. Officials consequently learn about the perspectives of refugees from these men. Based upon findings from two years of field research in Tanzania, the history of relations between ethnic Hutu elites and the peasantry in Burundi is outlined and it is explained why education has assumed such pronounced significance in Burundi refugee society. The use of ethnicity as a political tool for elite refugees is also described. It is concluded that elite refugees may not, as is often claimed, represent the refugee majority.

Adult↗
PubMedDate not supplied

Sensitive topics and adolescents: making research about risk behaviors happen.

This article discusses conducting research with adolescents as a positive experience, both from a clinical and scholarly perspective. However, topics involving risk-taking behaviors may be especially difficult for adolescents to discuss openly. To implement research protocols with the adolescent population, particularly when dealing with risk-taking behaviors, investigators need to be aware of developmental challenges that warrant specific methodological choices. In a pilot study that involved adolescents who had been hospitalized for traumatic injury, the researchers gained valuable experience in conducting a study on substance use. Experiences with the study provide direction for future research about investigating sensitive topics with adolescents.

Adolescent↗