Learning to decipher time-compressed speech: Robust acquisition with a slight difficulty in generalization among...

Area of Science:

• Cognitive psychology
• Neuroscience
• Speech perception

Background:

• Developmental dyslexia (DD) is often linked to difficulties in implicit and procedural skill learning.
• Understanding acoustically distorted speech is a key area for studying skill acquisition in DD.

Purpose of the Study:

• To investigate the learning and generalization of time-compressed speech in young adults with DD compared to typical readers (TD).
• To explore whether impaired generalization contributes to speech perception challenges in DD.

Main Methods:

• Participants (DD and TD) underwent training on judging semantic plausibility of time-compressed sentences using an adaptive staircase procedure.
• Learning was assessed via testing on familiar and novel speech materials, including generalization to new speakers and tokens.

Main Results:

• Both DD and TD groups demonstrated significant learning gains from training.
• The initial performance gap between DD and TD groups diminished post-training.
• DD individuals exhibited reduced generalization of learned skills to novel speech tokens and speakers compared to TD.

Conclusions:

• Individuals with DD benefit from experience with time-compressed speech similarly to TD individuals.
• The learning in DD appears more sensitive to specific input features, leading to atypical generalization.
• Impaired generalization, rather than overall learning deficits, may explain some speech perception inconsistencies in DD.