1 The seminal work in classical conditioning is Conditioned Reflexes: An Investigation of the Physiological Activity of the Cerebral Cortex by Ivan Pavlov, 1927 (translated and edited by G. V. Anrep, Dover Publications, 1984).

2 See “Conditioned Emotional Reactions” by John B. Watson and Rosalie Rayner, Journal of Experimental Psychology, 1920, vol. 3(1), p. 1–14; and “Reward Value of Attractiveness and Gaze” by Knut K. W. Kampe, Chris D. Frith, Raymond J. Dolan, and Uta Frith, Nature, 2001, v. 413, p. 589.

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