Females have less asymmetry than males between left and right hemispheric cortical thickness. This relates to the hemispheric attention factors discussed in the brain hemispheres section above. This darkening is responsible for the hemispheric albedo asymmetry mentioned above. Hemispheric differences within the hippocampus are also observed. Such thickness is critical in maintaining hemispheric crustal variations and preventing channel flow. Minor neurological differences regarding hemispheric processing exist between brains of males and females. The origin and age of the hemispheric dichotomy are still debated. These pre-modern phases of global or hemispheric exchange are sometimes known as archaic globalization. Chile has been an important actor on international economic issues and hemispheric free trade. The Swiss mathematician Johann Lambert invented several hemispheric map projections. This experimental design consisted of testing eleven right hemispheric stroke patients. It will also be fitted with a gimbaled seeker for hemispheric coverage.