Positional effects in the lexical retuning of speech perception

Area of Science:

• Psycholinguistics
• Auditory Perception
• Phonetics

Background:

• Listeners adapt to speaker variations using lexical information.
• Lexical knowledge influences the perception of ambiguous speech sounds.
• Previous studies suggest word-final sounds are crucial for this adaptation.

Purpose of the Study:

• To investigate the role of word position in lexically guided perceptual learning.
• To determine if lexical retuning is dependent on the position of the ambiguous sound within a word.
• To examine the generalizability of lexical retuning across different sound positions.

Main Methods:

• Dutch listeners were exposed to ambiguous speech sounds (/s/ vs. /f/) in word-initial and word-final positions.
• Lexical knowledge was manipulated by embedding ambiguous sounds in words that normally start or end with /s/ or /f/.
• Perceptual judgments of the ambiguous sounds were measured after exposure.

Main Results:

• No perceptual retuning was observed when ambiguous sounds were presented in word-initial positions.
• Significant perceptual retuning occurred when ambiguous sounds were presented in word-final positions.
• Lexical retuning generalized across syllabic positions, indicating position independence once learning occurred.

Conclusions:

• Lexically guided perceptual learning is most reliable when lexical information is processed concurrently with the ambiguous sound, particularly in word-final positions.
• The position of the sound during initial learning does not restrict its benefit to that specific position.
• Lexical retuning enhances the recognition of specific sounds regardless of their occurrence within a word.