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Biomedical subjects

D Millman

Publications and source records attributed to D Millman.

6 recordsLinked to original sources
PubMed1990

Mechanism of age-related differences in frequency discrimination with backward masking: speed of processing or stimulus persistence?

In Experiment 1, frequency-discrimination thresholds were estimated in a 2-interval, forced-choice, backward masking procedure with a masker acoustically dissimilar to the targets. Young subjects were more efficient in escaping the effects of masking than were their elderly counterparts. In Experiment 2, young and elderly subjects performed the same task, with a masker acoustically similar to the targets and with a target-dissimilar masker. Under target-similar masking and at short target-masker intervals, the elderly demonstrated significant improvement, reaching the level of performance of the young, whereas under the target-dissimilar masker, the age-related differences were restored. Both age-related slowing of information processing and increase in stimulus persistence can account for the results of Experiment 1, but only increased stimulus persistence explains the results of Experiment 2.

Adolescent↗
PubMedDate not supplied

Consequence of the Omnibus Budget Reconciliation Act of 1987: elimination of markup for certain diagnostic tests.

The Omnibus Budget Reconciliation Act of 1987 has significantly changed the rules governing the way in which charges must be made to Medicare concerning certain tests, including ultrasound, by a physician who provides these tests by means of an outside supplier. If the physician does not identify the supplier or indicate the amount charged by the supplier for the test, no payment is allowed, and the physician may not bill the beneficiary any amount for the test.

Budgets↗
PubMedDate not supplied

Auditory memory and age-related differences in two-tone frequency discrimination: trace decay and interference.

We investigated age-related differences in the time course of two-tone frequency discrimination. Healthy young and elderly adults with normal hearing acuity in the 500-2000 Hz range performed a two-alternative forced choice frequency discrimination task. The stimuli were short tones separated by either a 250-ms (short), 850-ms (medium), or 3000-ms (long) silent inter-interstimulus interval (ISI). Frequency discrimination thresholds were estimated using an adaptive staircase procedure. Although young listeners performed better than the elderly at all ISIs, the latter showed a dramatic elevation of discrimination thresholds at 250 ms, while the thresholds of the young subjects increased significantly at 3000 ms. These results suggest that the elderly may be especially vulnerable to the effects of masking produced by the second tone at the short interval, whereas the young listeners tend to be differentially affected by the trace decay at long ISI. The results are discussed in the framework of stimulus persistence hypothesis.

Acoustic Stimulation↗