Extinction of a Conditioned Stimulus Essay
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In this experiment, an untrained rat was utilized in order to display the Movement Ratio. 1 stage was selected with ten (10) trials. Each trial had a five (5) minute interval between trials to allow the rat to recover from the medium intensity shock.
A medium intensity tone was selected as the Conditioned Stimulus (CS) selected to precede the Unconditioned Stimulus (US), a medium intensity shock. Stage 2 was selected with thirty (30) trials. Each had a five (5) minute interval between trials to allow the rat to recover from the medium intensity shock. A medium intensity tone was selected as the Conditioned Stimulus (CS) to precede the new Unconditioned Stimulus (US), no stimulus.
In the first set of trials, Sniffy will learn to associate the tone with shock; illustrating fear-related behavior or freezing behavior at the tone. In the second set of trials, stage 2, elimination of a conditioned response (CR) (freezing or fear-related behavior) learned in the first set of trials will occur by repeatedly presenting the CS without the US.
In the first set of trials; the increase from 0 to 0.7 in the Movement Ratio illustrates that the tone CS, is acquiring the capacity to induce freezing behavior and other fear-related behaviors. As the movement ratio increases, the CS response strength mind window show that the tone’s capacity to elicit fear as a psychological process is increasing. In the second set of trials; the movement ratio window illustrates that repeatedly presenting the CS without the US causes the CS to gradually stop eliciting the freezing and other fear-related behavior.
The CS Response Strength mind window shows that this behaviors change is the result of the CS’s losing its capacity to elicit the fear response. Independent Variable (IV) – first trial = shock; second trail = none Dependent variable (DV) – first and second; fear-related behavior, freezing behavior The movement ratio is the proportion of time during each CS presentation that Sniffy is frozen or manifesting other fear-related behaviors.