Kevin Jones, Filiz Gözenman, & Marian Berryhill

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Transcranial direct current stimulation facilitates episodic memory encoding Kevin Jones, Filiz Gözenman, & Marian Berryhill Cognitive & Brain Sciences, University of Nevada Introduction The parietal lobe is involved in LTM, however the exact role is still being debated via various models. (Subjective experience: Davidson 2008, CoBRA: Shimamura 2011, internal representations/output buffer/ mnemonic accumulator: Wagner 2005) Question Is the parietal lobe more involved in LTM at encoding or consolidation? If encoding, tDCS should improve learning rate when applied during word-list learning. Experiment 1 If consolidation, tDCS should improve long delay free-recall when applied during consolidation period. Experiment 2 Methods 15 minutes of P3 tDCS (1.5 mA) during encoding of California Verbal Learning Task (CVLT) CVLT is a test of learning, consolidation, and retrieval of word lists Spatial 2-back N = 16 15 minutes of P3 tDCS (1.5 mA) during consolidation Dropped second 2-back and FC recognition tasks Maybe switch learning rate for sdfr in exp 2 Experimental Design Main Findings Posterior parietal lobe is involved in encoding of new long-term memories  Experiment 1: PPC TDCS improved learning rate of word lists as compared to sham stimulation  Experiment 2: No benefit of stimulation after list learning during delay period Conclusions PPC sensitive to tDCS stimulation during encoding PPC less relied upon during consolidation period Kevin Jones: kevjones22@gmail.com Dr. Marian Berryhill: mberryhill@unr.edu Cognitive and Brain Sciences Department of Psychology, MS 296 University of Nevada Reno, NV 89557 References Davidson, P.S., Anaki,D., Ciaramelli, E., Cohn, M., Kim, A.S., Murphy, K. J., Troyer, A.K., Moscovitch,M., and Levine,B.(2008) .Doeslateral parietal cortex support episodic memory?Evidence from focal lesion patients. Neuropsychologia 46, 1743 – 1755. Shimamura, A.P. (2011). Episodic retrieval and the cortical binding of relational activity. Cogn. Affect. Behav. Neurosci. 11, 277–291. Wagner, A.D., Shannon, B.J., Kahn,I., and Buckner, R.L.(2005). Parietal lobe contributions to episodic memory retrieval. Trends Cogn.Sci. 9, 445–453. Experiment 1 – tDCS during encoding Faster Learning! Experiment 2 – tDCS during consolidation