On the Causal Role of the Right Lateral Prefrontal Cortex in Active Forgetting

Extensive research has demonstrated that people can intentionally forget by inhibiting the retrieval of unwanted memories, a phenomenon known as suppression-induced forgetting (SIF). Although neuroimaging studies have linked retrieval suppression to the right lateral prefrontal cortex (LPFC), direct evidence for the causal role this region plays in supporting SIF is still lacking. In this registered report, our aim is putting to a strong empirical test such an idea by using cathodal transcranial direct current stimulation in a standard think/no-think procedure. Across two experiments, we will compare the SIF achieved by participants receiving cathodal transcranial direct current stimulation over the right LPFC-which has been shown to disrupt prefrontally mediated inhibitory control-with those receiving sham stimulation or cathodal stimulation over a control site. In addition, we will examine the lateralization of this effect by comparing stimulation of the right and left LPFC. Our results will provide novel and critical insights into the brain mechanisms of inhibitory control.