Using prefrontal transcranial direct current stimulation (tDCS) to enhance proactive cognitive control in...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is associated with deficits in proactive cognitive control.
• The prefrontal cortex (PFC) plays a crucial role in cognitive control.
• Neural oscillations, particularly gamma activity, are implicated in cognitive control.

Purpose of the Study:

• To investigate the role of the PFC in proactive cognitive control in schizophrenia using transcranial direct current stimulation (tDCS).
• To examine the effects of PFC-targeted tDCS on behavioral and electrophysiological markers of proactive cognitive control in schizophrenia patients.

Main Methods:

• A within-participants, double-blinded, sham-controlled crossover design was employed.
• Participants with schizophrenia received 20 minutes of either active or sham prefrontal tDCS.
• Electroencephalography (EEG) was recorded during the Dot Pattern Expectancy (DPX) Task, a measure of proactive cognitive control.

Main Results:

• Active PFC tDCS led to significant changes in error rates on the DPX task, indicating improved performance.
• EEG data revealed increased gamma power during periods taxing proactive cognitive control following active tDCS.
• These changes suggest enhanced proactive cognitive control with frontal tDCS.

Conclusions:

• The findings support the role of gamma oscillations in proactive cognitive control.
• Frontal tDCS shows promise as a non-invasive neuromodulation technique to enhance proactive cognitive control in schizophrenia.
• This study provides novel evidence for the efficacy of tDCS in addressing cognitive deficits in schizophrenia.