Effects of combining retrieval practice and tDCS over long-term memory: A randomized controlled trial

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Long-term memory retention is crucial for daily functioning.
• Retrieval practice (RP) and transcranial direct current stimulation (tDCS) are promising techniques for enhancing memory.
• The left dorsolateral prefrontal cortex (l-dlPFC) is implicated in memory encoding and organization.

Purpose of the Study:

• To investigate if retrieval practice (RP) combined with transcranial direct current stimulation (tDCS) over the left dorsolateral prefrontal cortex (l-dlPFC) enhances long-term memory retention.
• To assess the impact of RP and tDCS on memory recall and organization.

Main Methods:

• 119 participants were divided into retrieval practice (RP) or restudy groups.
• Participants underwent either anodal or sham transcranial direct current stimulation (tDCS) for 20 minutes.
• A free-recall test was administered two days after the initial session.

Main Results:

• The retrieval practice (RP) group demonstrated superior performance across all memory measures compared to the restudy group.
• Recall organization was significantly higher in the retrieval practice (RP) group.
• The effects of transcranial direct current stimulation (tDCS) type (anodal vs. sham) did not influence the outcomes.

Conclusions:

• Retrieval practice (RP) is an effective strategy for enhancing long-term memory retention and improving the organization of recalled information.
• The findings suggest that RP enhances memory performance independently of tDCS modulation over the l-dlPFC.
• Retrieval practice (RP) may improve memory by facilitating better organization of to-be-remembered items.