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Classical conditioning occurs when a conditioned stimulus (CS) is paired with an unconditioned stimulus (US). Usually, the conditioned stimulus is a neutral stimulus (e.g., the sound of a tuning fork), the unconditioned stimulus is biologically potent (e.g., the taste of food) and the unconditioned response (UR) to the unconditioned stimulus is an unlearned reflex response (e.g., salivation).
In Kamin's blocking effect [1] the conditioning of an association between two stimuli, a conditioned stimulus (CS) and an unconditioned stimulus (US) is impaired if, during the conditioning process, the CS is presented together with a second CS that has already been associated with the unconditioned stimulus.
Edwin Burket Twitmyer (1873–1943) was professor of Psychology and director of the Psychological Laboratory and Clinic at the University of Pennsylvania.He is a little-known figure in the history of psychology, but he independently discovered classical conditioning at approximately the same time as the famous Russian physiologist, Ivan Pavlov, who is normally given credit for this achievement.
In classical conditioning, when a conditioned stimulus is presented alone, so that it no longer predicts the coming of the unconditioned stimulus, conditioned responding gradually stops. For example, after Pavlov's dog was conditioned to salivate at the sound of a metronome, it eventually stopped salivating to the metronome after the metronome ...
The Rescorla–Wagner model ("R-W") is a model of classical conditioning, in which learning is conceptualized in terms of associations between conditioned (CS) and unconditioned (US) stimuli. A strong CS-US association means that the CS signals predict the US.
An example of second-order conditioning. In classical conditioning, second-order conditioning or higher-order conditioning is a form of learning in which a stimulus is first made meaningful or consequential for an organism through an initial step of learning, and then that stimulus is used as a basis for learning about some new stimulus.
It has become immortalized in introductory psychology textbooks as the Little Albert experiment. The goal of the experiment was to show how principles of, at the time recently discovered, classical conditioning could be applied to condition fear of a white rat into "Little Albert", a 9-month-old boy. Watson and Rayner conditioned "Little Albert ...
External inhibition was especially observed when the tone (external stimulus) was introduced during the acquisition phase, which was the interval right after the paired CS-UCS trials. The conditioned response, blinking reflex, was observed to be in decline (inhibited) compared to the rate during conditioning. [5]