Repetitive Microstimulation In Rat Primary Somatosensory Cortex (SI) Strengthens The Connection Between Homotopic Sites In The Opposite SI And Leads To Expression Of Previously Ineffective Input From The ipsilateral Forelimb.

•An interhemispheric pathway links homotopic forelimb sites in layer V of rat SI.•Repetitive stimulation strengthens spike firing in homotopic sites in opposite SI.•Pathway strengthening may lead to previously ineffective ipsilateral input in SI.•Newly expressed ipsilateral input depends upon an intact interhemispheric pathway.