Word Learning in Aphasia: Does Time of Day Matter?

Area of Science:

• Neurolinguistics
• Cognitive Psychology
• Sleep Science

Background:

• Aphasia, a language disorder post-stroke, significantly impacts communication.
• Optimizing aphasia treatment requires understanding outcome variables like timing.
• Previous research suggests time-of-day influences learning and memory consolidation.

Purpose of the Study:

• To investigate the impact of naming training timing (morning vs. evening) on chronic post-stroke aphasia.
• To test the hypothesis that evening training yields more durable learning compared to morning training.

Main Methods:

• A within-participant study involving 13 individuals with chronic aphasia.
• Online confrontational naming training conducted in both morning and evening sessions.
• Post-training retention assessed at multiple time points, including a 24-hour delay.

Main Results:

• Words trained in the evening demonstrated stable retention over time.
• Words trained in the morning showed a significant decline in retention after a 24-hour delay.
• No overall difference in average naming accuracy was found between morning and evening conditions.

Conclusions:

• The timing of aphasia treatment, specifically naming training, is a critical factor for optimizing outcomes.
• Sleep may play a protective role in retaining learned information, supporting evening training benefits.
• Consideration of diurnal rhythms and sleep proximity is recommended for aphasia therapy scheduling.