Citation
Evolution of the Brain and Intelligence
TL;DR
Defined encephalization quotient (EQ) methodology
Established the encephalization quotient methodology for comparing brain sizes across species. Documents human EQ of ~7-8, meaning human brains are 7-8 times larger than expected for a mammal of equivalent body size. This framework helps understand how cognitive capacity scales with organism size.
Key Findings from Jerison (1973)
- Defined encephalization quotient (EQ) methodology
- Human EQ ~7-8 (brain 7-8x larger than expected for body size)
- Brain mass scales as body mass^0.75 across mammals