NEUROLOGICAL RESEARCH, vol.37, no.2, pp.139-146, 2015 (Journal Indexed in SCI)
Objective: To investigate siblings from Kars (n = 2), Turkey, with diagonal-sequence quadrupedal locomotion (QL), severe mental retardation, and no speech (Uner Tan syndrome, UTS), in relation to the evolutionary emergence of human bipedal locomotion (BL).