No Enhancing Effect of Fronto-Medial tDCS on Working Memory Processes

Friedrich, Elisabeth V. C.; Berger, Barbara; Minarik, Tamas; Schmid, Doris; Peylo, Charline; Sauseng, Paul

doi:10.1007/s41465-019-00136-5

Cited by 2 publications

(1 citation statement)

References 35 publications

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“…Perhaps by entraining mPFC neurons to a frequency that did not match their intrinsic frequency in some of our participants, we disrupted the system, rather than helped it. Yet, some studies have also reported no effects of midfrontal theta tACS, albeit on a working memory task (Friedrich et al 2019). Alternatively, it is hence also possible that theta stimulation had no effect, but that alpha stimulation improved performance.…”

Section: Discussionmentioning

confidence: 99%

Effects of Midfrontal Brain Stimulation on Sustained Attention

et al. 2020

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Sustained attention is defined as the ability to maintain attention over longer periods of time, which typically declines with time on task (i.e., the vigilance decrement). Previous studies have suggested an important role for the dorsomedial prefrontal cortex (mPFC) in sustained attention. In two experiments, we aimed to enhance sustained attention by applying transcranial electrical current stimulation over the mPFC during a sustained attention task. In the first experiment, we applied transcranial direct current stimulation (tDCS) in a between-subject design (n = 97): participants received either anodal, cathodal, or sham stimulation. Contrary to our prediction, we found no effect of stimulation on the vigilance decrement. In the second experiment, participants received theta and alpha transcranial alternating current stimulation (tACS) in two separate sessions (n = 47, within-subject design). Here, we found a frequency-dependent effect on the vigilance decrement, such that contrary to our expectation, participants’ performance over time became worse after theta compared with alpha stimulation. However, this result needs to be interpreted with caution given that this effect could be driven by differential side effects between the two stimulation frequencies. To conclude, across two studies, we were not able to reduce the vigilant decrement using tDCS or theta tACS.

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Section: Discussionmentioning

confidence: 99%

Effects of Midfrontal Brain Stimulation on Sustained Attention

et al. 2020

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Effects of mid-frontal brain stimulation on sustained attention

Schouwenburg

Sligte

Giffin

et al. 2019

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Vigilant attention is defined as the ability to sustain attention over longer periods of time in a non-stimulating environment. Previous studies have suggested an important role for the dorsomedial prefrontal cortex (mPFC) in vigilant attention. In this manuscript, we describe two experiments in which we aimed to enhance vigilant attention by applying transcranial electrical current stimulation over the mPFC. Specifically, we were interested in reducing the often observed decline in performance with time-on-task, the so-called vigilance decrement. In the first experiment, we applied transcranial direct current stimulation (tDCS) in a between-subject design (n=97): participants received either anodal, cathodal, or sham stimulation. In contrast to our prediction, we found no effect of stimulation on the vigilance decrement. In the second experiment, we applied transcranial alternating current stimulation (tACS). Participants received alpha and theta stimulation in two separate sessions (n=47, within-subject design). Here, we found a frequency-dependent effect on the vigilance decrement, such that contrary to our expectation, participants performance over time became worse after theta stimulation, compared to alpha stimulation. However, this result needs to be interpreted with caution given that at least part of this effect seems to be driven by the intensity of side effects experienced during the two stimulation frequencies. To conclude, across the two studies we were not able to reduce the vigilant decrement using tDCS or theta tACS.

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No Enhancing Effect of Fronto-Medial tDCS on Working Memory Processes

Cited by 2 publications

References 35 publications

Effects of Midfrontal Brain Stimulation on Sustained Attention

Effects of Midfrontal Brain Stimulation on Sustained Attention

Effects of mid-frontal brain stimulation on sustained attention

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