Lateralized effects of post-learning transcranial direct current stimulation on motor memory consolidation in older adults: An fMRI investigation

•Effect of anodal tDCS on motor memory consolidation in older adults is lateralized.•Post-learning tDCS to right M1 disrupted motor memory consolidation.•Post-learning tDCS to left M1 did not affect motor memory consolidation.•Sustained recruitment of early learning brain areas paralleled impaired consolidation.•tDCS-based neuro-rehabilitative approaches should consider lateralized effects.