tACS on subjectively perceived memory confidence.

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tDCS vs tACS

Effects of parietal exogenous oscillatory field potentials on subjectively perceived memory confidence.

Previous research suggests involvement of parietal theta (3-7 Hz) power in subjectively perceived memory confidence during retrieval. To obtain further insights into the role of parietal theta activity during retrieval in processes associated with performance and confidence, fifty-four healthy volunteers performed a recognition memory task in a within-subject sham controlled transcranial alternating current stimulation (tACS) study. Participants encoded a subset of words at specific on-screen locations. During the retrieval phase accuracy and subjectively perceived confidence on item and source memory were evaluated while administering exogenous alternating field potentials. Results showed that 3.5 Hz tACS decreased subjectively perceived memory confidence as compared to sham and 8 Hz tACS. No tACS effects were found on accuracy regarding item and source memory. Our findings suggest that theta activity in the parietal cortex is implicated in subjectively perceived confidence in word recognition.

PMID: 31843652 [PubMed – indexed for MEDLINE]

Neurobiol Learn Mem. 2020 02;168:107140

Authors: Wynn SC, Kessels RPC, Schutter DJLG