Effect of Hemispheric Asymmetry and Sleep on Motor Memory Consolidation
| Author | Parvaneh Shamsipour Dehkordi | en |
| Author | Parisa Hejazi Dinan | en |
| Author | Mahtab Heydari | en |
| Author | Fatemeh Meysamnejad | en |
| Orcid | Parvaneh Shamsipour Dehkordi [0000-0001-7750-5734] | en |
| Orcid | Parisa Hejazi Dinan [0000-0001-5743-2566] | en |
| Orcid | Mahtab Heydari [0009-0008-3031-4883] | en |
| Issued Date | 2025-08-31 | en |
| Abstract | Background: Motor memory consolidation refers to the neurobiological process by which newly acquired motor skills transition from a labile, short-term state to a stable, long-term form. Understanding the factors influencing this process is essential for optimizing skill retention and performance. Research indicates that sleep and hemispheric lateralization significantly affect the rate of memory consolidation. Objectives: This study examined the combined effects of hemispheric lateralization (hand dominance) and sleep on motor memory consolidation. Methods: Forty-eight students aged 20 to 27 years were selected based on inclusion criteria and randomly assigned to four groups: Right-handed individuals practicing with their right hand (R-R), right-handed individuals practicing with their left hand (R-L), left-handed individuals practicing with their left hand (L-L), and left-handed individuals practicing with their right hand (L-R). Participants completed 180 trials (9 blocks × 20 trials) of a serial color-matching task during acquisition, followed by a two-choice reaction time task during transfer tests (20 trials) administered at immediate, 15-minute, and 24-hour intervals. Results: Mixed ANOVA revealed a significant performance difference between groups across training blocks (P = 0.005). All four groups (L-L, R-R, L-R, R-L) showed improved performance in the final training block compared to the first, with the L-L and R-R groups demonstrating the best performance. All groups performed better in the immediate transfer test than in the 15-minute rest-interval transfer test. Memory performance in the 24-hour rest-interval transfer test differed significantly from both the immediate and 15-minute transfer tests (P = 0.001). The 24-hour transfer test yielded better memory performance than both the 15-minute and immediate transfer tests, with the L-L and R-R groups again performing best. In contrast, the R-L and L-R groups exhibited weaker performance across transfer tests. Conclusions: Both sleep-dependent consolidation and hemispheric specialization (hand dominance) significantly enhance motor memory consolidation, with optimal performance observed when skills are practiced with the dominant hand followed by sleep. | en |
| DOI | https://doi.org/10.5812/jmcl-149890 | en |
| Keyword | Hemispheric Asymmetry | en |
| Keyword | Rest Time | en |
| Keyword | Sleep | en |
| Keyword | Motor Learning | en |
| Keyword | Memory Consolidation | en |
| Publisher | Brieflands | en |
| Title | Effect of Hemispheric Asymmetry and Sleep on Motor Memory Consolidation | en |
| Type | Research Article | en |
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