| Popis: |
The comodulation masking release (CMR) paradigm permits assessment of across‐channel auditory processing. To evaluate the development of this phenomenon, CMR was measured in 81 children (M=8.95 years) and 20 adults (M=23.3 years). A single‐interval, maximum‐likelihood procedure was used to estimate thresholds in a reference condition (signal plus on‐signal AM masker) and a modulated masker condition (reference condition plus eight comodulated flanking bands). CMR was defined as improvement in signal detection in the modulated masker condition relative to the reference condition. Although total CMR did not change from 7 to 10 years of age, total CMR for children (4.02 dB) was significantly less than that for adults (10.85 dB), suggesting that across‐channel processing develops beyond 10 years of age. In addition, thresholds for children were significantly higher than those for adults in both the reference condition (by 6.47 dB) and the modulated masker condition (by 13.91 dB), supporting the likelihood that processing efficiency also develops beyond 10 years of age. These results suggest that both processing efficiency and across‐channel cues utilized in CMR are slowly developing phenomena. [Work supported by a grant from the Georgia State University Research Program Enhancement Program.] |
