| Term | Definition |
| Geschwind and Levitsky | studied 100 brains from Yakolev collection. from visual examination reported that planum temporal was large in left hemisphere in 68% of cases, larger in right hemisphere in 10% of cases, equal sizes (symmetrical) in 22% of cases |
| Wada | measured PT in stillborns and found PT was larger in LH relative to RH. Therefore, this size difference is genetically prespecified at birth and not due to language experience during development |
| Galaburda | performed cytoarchitectonic measurements of area 22 (temporo-parietal cortex) and reported 7 X larger in LH than RH |
| Falzi | first to report that Broca's area was larger in LH than RH. This finding was due to the fact that he was the first to measure cortical tissue buried deep in sulci and not just visible lateral cortex tissue |
| Scheibel | examined brancing pattern of dendrites of Golgi I neurons in layer III of cortex. Reorted that total dendritic length was equal in LH and RH opercular, but in LH the higher order branches contributed a greater percentage to total length relative to lower order branches. Goal is to discover if critical maturation period for language corresponds to emergence of increased area for higher order branches of dendritic structure in LH. |
| corpus callosum | transfers information across hemispheres (Meyer and Sperry) |
| progressive neurogenesis | proliferation of neurons |
| regressive neurogenesis | cell death; removal of excess neurons |
| neurogenesis | development of cell tissue in utero |
| dichotic listening | Broadbent; contralateral audio stimulus |
| visual modality | tachistoscopic visual presentation |