Part 3/15:
The speaker underscores the historical and scientific significance of IQ research, tracing its roots back to the 1920s. This branch of psychology is portrayed as foundational, partly because it established important statistical techniques now prevalent across psychological research. Skeptics who dismiss IQ tests are warned that doing so could undermine the entire fabric of psychological science, as IQ measurement has historically been a precise and reliable way to assess a core aspect of intelligence.