The TOT-object paradigm: towards a greater understanding of speech disfluencies during tip-of-the-tongue states in older adults.

Participants produced more disfluencies during TOT states than during fluent naming.

• The study used a controlled Tip-of-the-Tongue (TOT) Object Paradigm designed to elicit TOT states under well-defined conditions.
• Twenty-seven younger (<25 years) and twenty-six older (60-72 years) adults learned and named newly created objects associated with pseudoword labels.
• Disfluencies specifically elevated during TOTs included silent pauses, filled pauses, conduites d'approche, and phonological errors.
• These behaviors were interpreted as confirming that they 'index word-form retrieval difficulty.'

Disfluency patterns were comparable in solved and unsolved TOT states.

• TOTs were categorized as solved or unsolved following phonological cueing.
• No significant difference in disfluency patterns was found between solved and unsolved TOTs.
• This finding suggests that disfluencies 'reflect retrieval difficulty rather than retrieval success.'
• The result implies that disfluencies cannot be used to predict whether a TOT will ultimately be resolved.

Older adults produced significantly more disfluencies than younger adults in the no-TOT condition.

• Older participants were aged 60-72 years; younger participants were under 25 years.
• The age-related difference in disfluencies was specifically observed during fluent naming (no-TOT condition), not only during TOT states.
• This pattern was interpreted as evidence of 'possible age-related differences in metacognitive monitoring.'
• The authors suggest older speakers 'may experience retrieval difficulty without consciously reporting a TOT.'

The TOT-object paradigm provides a reproducible method to investigate word-form retrieval and its modulation by age.

• The paradigm involved participants learning newly created objects paired with pseudoword labels, allowing controlled elicitation of TOT states.
• The design isolates disfluencies specifically linked to word-form retrieval failure, distinguishing them from disfluencies arising from other sources.
• The paradigm was described as providing a method to investigate 'the behavioral and metacognitive correlates of word-form retrieval.'
• The authors position the paradigm as an improvement over existing literature that broadly categorizes disfluencies as indicators of word-finding difficulties without isolating their source.

Existing literature on speech disfluencies in healthy aging often categorizes them as indicators of word-finding difficulties despite disfluencies arising from multiple sources.

• The authors identify a limitation in prior research in that disfluencies are not uniformly caused by word-form retrieval failure.
• The motivation for using the TOT paradigm was specifically to isolate disfluencies linked to word-form retrieval failure under well-defined conditions.
• The TOT-object paradigm was introduced as a controlled task to address this gap in the literature.