title: Are there structural alterations in synapses related to functioning?
mesh_terms: D000818:Animals; D002540:Cerebral Cortex / Q000033:anatomy & histology*; D003624:Darkness; D007858:Learning; D008854:Microscopy, Electron; D051381:Rats; D013569:Synapses / Q000033:anatomy & histology* / Q000502:physiology; D014793:Visual Cortex / Q000033:anatomy & histology