Abstract
The recognition of brief vowels was studied in forward- and backward-masking paradigms. In a series of experiments in which both target and mask parameters were systematically varied, two populations of subjects were consistently identified. The majority (nonmaskers) evidenced no masking at any interstimulus interval (ISI) while relatively fewer subjects (maskers) evidenced backward masking (but not forward masking) out to 100–200 msec ISI. Increasing target set size systematically increased the extent of masking for the maskers. Adding −15-dB white noise relative to the vowel amplitude increased the extent of masking for both groups. These results suggest two parallel recognition routines for vowels, at least one of which may involve a serial search process.
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