Cultural Transmission and Diffusion

Cultural transmission and diffusion both describe how culture spreads, but they describe fundamentally different processes — and the MCAT will absolutely exploit that confusion. Cultural transmission is intergenerational: it's how a society passes its norms, values, and practices to the next generation through socialization. Cultural diffusion is cross-cultural: it's how cultural elements spread from one society to another. Keeping that distinction sharp is the core task here.

The exam tests this concept mostly through passage interpretation. You'll get a paragraph about globalization, immigration, or media influence, and you'll need to correctly label what's happening — is a cultural trait being passed down within a group, or borrowed across group lines? The MCAT also expects you to know the internal sources of cultural change: invention (creating something new), discovery (recognizing something that already exists), and innovation (applying existing knowledge in a new way). These are distinct from diffusion, which is external. Students who only know diffusion as a concept will miss questions about why cultures change from within.

The trickiest part isn't the definitions — it's the passage application. A passage might describe immigrants adapting food traditions, and students who assume diffusion means wholesale copying will misread the adaptation as something else. Diffusion almost always involves selective borrowing: the receiving culture filters and modifies what it takes in. That adaptation isn't a failure of diffusion — it's how diffusion actually works.