Negative as well as positive synaptic changes may store memory.
D000818:Animals; D008568:Memory; D008854:Microscopy, Electron; D009778:Occipital Lobe / Q000033:anatomy & histology; D051381:Rats; D013569:Synapses / Q000033:anatomy & histology* / Q000166:cytology / Q000254:growth & development