Categorization is modulated by transcranial direct current stimulation over left prefrontal cortex

► We use transcranial direct current stimulation (tDCS) to study categorization. ► tDCS is applied over LIFG with the goal of modulating cognitive control. ► tDCS affected categorization hypothesized to require more cognitive control. ► Cathodal tDCS led to lower hit rates. ► Anodal tDCS led to an increase selections of marginal category members.