Task complexity and manual reaction times in people who stutter

Area of Science:

• Speech and Language Pathology
• Cognitive Psychology
• Neuroscience

Background:

• Stuttering is a speech disorder characterized by disruptions in fluency.
• Previous research suggests potential differences in information processing between people who stutter and those who do not.
• Reaction time tasks are used to investigate cognitive processing speed and efficiency.

Purpose of the Study:

• To test if manual reaction time differences in stutterers reflect task information processing complexity.
• To examine the impact of decision complexity on reaction times in adults who stutter and do not stutter.
• To differentiate between decision complexity and response complexity in relation to stuttering.

Main Methods:

• A reaction time paradigm was employed with adult stutterers and non-stutterers.
• Decision complexity was manipulated by varying the number of response alternatives.
• Spatial contiguity between signal and response locus was also manipulated.
• Response initiation and completion times were measured across different task conditions.

Main Results:

• Contrary to the hypothesis, no significant Group x Complexity interaction was found for either response measure.
• Stutterers exhibited slower overall reaction times compared to non-stutterers.
• Group response times increased in parallel as decision complexity increased.

Conclusions:

• Manual reaction time differences in stuttering are likely independent of decision complexity.
• Potential response planning and organization deficits in stuttering may be related to response complexity, not decision complexity.
• Further research should explore spatial and temporal coordination in response complexity for individuals who stutter.