The discovery of "pleasure centers" and of motion and line detectors in the brain did not occur until after the modern development of sophisticated brain scan techniques such as PET scans, CAT scans, and fMRI.

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The discovery of "pleasure centers" in the brain was made in the 1950s through electrical stimulation experiments by James Olds and Peter Milner, well before the development of advanced brain imaging technologies like PET scans, CAT scans, and fMRI. Similarly, the understanding of motion and line detectors in the visual cortex was advanced through neurophysiological studies in animals, particularly the work of David Hubel and Torsten Wiesel in the 1950s and 1960s, which also predates the widespread use of these sophisticated brain scan techniques.

The Discovery of "Pleasure Centers" and of Motion and Line