ERIC Number: ED307989
Record Type: Non-Journal
Publication Date: 1987-Apr
Reference Count: N/A
Pulsation Threshold Tuning Curves in 3- and 6-Month-Old Human Infants.
Spetner, N. B.; Olsho, Lynne Werner
Pulsation threshold (PT) masking was used to assess frequency resolution among infants 3 and 6 months of age and adults. The masker intensity at which the pulsing probe becomes indistinguishable from a physically continuous probe is the PT. A measure of frequency resolution can be obtained by examining the effects of masker frequency on the PT. In the PT masking technique, two tone bursts were presented in alternation. As the intensity of the masker tone was increased, the probe began to sound continuously. Probe frequencies between 500 and 4,000 Hz were used. PTs were determined by randomly presenting signal trials in which a pulsating probe alternated with a pulsating masker of variable intensity or frequency; and no-signal trials, in which the probe was physically continuous and the masker remained pulsating. A blind observer judged whether a signal or no-signal trial had been presented, based on the infant's behavior. Infant responses to signals were reinforced by the activation of a mechanical toy. Preliminary results suggest that masker frequency affects 6-month-olds' and adults' PTs in much the same way. Frequency resolution becomes progressively better at higher frequencies. (Author/RH)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Sponsor: National Inst. of Neurological and Communicative Disorders and Stroke (NIH), Bethesda, MD.
Authoring Institution: N/A