Nonstrategic subjective threshold effects in phonemic masking

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Auditory Perception

Background:

• Backward masking is a technique used to study visual and auditory perception.
• The phonemic mask reduction effect (MRE) is a phenomenon where phonemically similar masks interfere with target word identification.
• Understanding factors influencing MRE is crucial for models of speech perception.

Purpose of the Study:

• To investigate the relationship between subjective threshold and the magnitude of the phonemic mask reduction effect (MRE).
• To determine if stimulus-based response strategies influence the phonemic MRE.
• To explore the role of automatic phonological activation in backward masking.

Main Methods:

• Three backward-masking experiments were conducted.
• Target words were presented and backward masked by graphemically similar nonwords, phonemically similar nonwords, or unrelated controls.
• Varying baseline identification rates and controlling for the percentage of phonemic trials were employed.

Main Results:

• Identification rates were higher with phonemic masks compared to graphemic masks.
• The magnitude of the phonemic MRE was significantly larger when baseline identification rates were below the subjective threshold.
• The phonemic MRE magnitude was independent of stimulus-based response strategies.

Conclusions:

• The phonemic MRE is influenced by subjective thresholds, indicating its dependence on the ease of initial word processing.
• The findings support the notion of rapid, automatic phonological activation during speech perception.
• The phonemic MRE is not driven by conscious, stimulus-driven response strategies.