Transcranial direct current stimulation of dorsolateral prefrontal cortex during encoding improves recall but not...

Area of Science:

• Cognitive Neuroscience
• Neuromodulation

Background:

• Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique.
• Previous research suggests tDCS can enhance memory functions.

Purpose of the Study:

• To investigate the effects of tDCS on face-name associative memory.
• To assess both immediate and delayed effects of tDCS on memory recall and recognition.

Main Methods:

• Participants received either active (1.5mA) or sham (.1mA) tDCS over the left dorsolateral prefrontal cortex (dlPFC) during face-name pair encoding.
• Memory was tested on day one (immediate) and day two (24-hour delay) using recall and recognition tasks.

Main Results:

• Active tDCS significantly improved recall performance by over 50% compared to sham stimulation at both time points.
• No significant differences in recognition memory were found between the active and sham stimulation groups.

Conclusions:

• tDCS applied during encoding enhances memory recall, likely by improving the richness of memory details supporting recollection.
• The benefits of tDCS on memory are more evident in recall tasks than recognition tasks, suggesting a role in recollection-dependent memory processes.