Classical conditioning

For every well-intentioned soul who takes it upon themselves to point out any controversy in the media regarding sexism, racism
It is striking just how similar Descartes' theory on 'reflex' is to Pavlov's theory of 'conditioning'. Just as in Pavlov's conditioning experiment, performed two hundred and seventy one years after Descartes' letter outlines his theory of 'reflex', the two stimuli necessary for conditioning, the conditioned and unconditioned stimuli, are paired causing the 'planned conditional response'.