The migration of cells in the developing cerebral cortex in which cells move from the ventricular and/or subventricular zone toward the surface of the brain. [ GOC:dgh GOC:jid GOC:cls GOC:dph http://www.ncbi.nlm.nih.gov/pubmed/12626695 http://purl.obolibrary.org/obo/go/references/0000021 ]