An orienting response to a repeated harmless tone has an amplitude of 75 arbitrary units on the first presentation, and each further presentation produces a response 36 percent smaller than the one before it. What is the amplitude on the fourth presentation?
7C. Classical Conditioning: the Stimuli and the Responses
After 31 pairings of a bell with food, a dog produces 7 drops of saliva to the bell presented alone, compared with 21 drops to the food itself. What percentage of the unconditioned response does the conditioned response reach?
7C. Acquisition, Extinction and Spontaneous Recovery
At the end of acquisition a conditioned response measures 91 units. Repeated presentations of the conditioned stimulus without the unconditioned stimulus drive it down to 18 units. After a rest of 7 days with no further trials, the first presentation produces 55 units. What percentage of the extinguished response has come back on its own?
A pigeon trained to peck at a 1000 hertz tone responds 88 times a minute to that tone, and the rate falls by 7 responses a minute for every 100 hertz of difference from it. What response rate does the generalization gradient predict at 1573 hertz?
7C. Operant Conditioning: Positive and Negative Reinforcement
A rat presses a lever 13 times an hour at baseline. A loud noise is then turned on continuously and switched off for a minute whenever the lever is pressed, and the rate rises to 77 presses an hour. By what percentage has pressing increased?
A behaviour occurs 54 times a week. A punisher is introduced and the rate falls to 8 times a week while the punisher is in place. By what percentage has the behaviour been suppressed?
On a ward token economy, 11 tokens can be exchanged for one item from the shop. A patient earns 180 tokens over a week. How many items can they exchange them for?
A factory pays a worker one bonus for every 32 units assembled, which is a fixed-ratio schedule. The worker assembles 757 units during a shift. How many bonuses does the shift earn?
A behaviour is running at 33 occurrences an hour under continuous reinforcement. Reinforcement is stopped, and in the first hour afterwards the rate rises to 80 occurrences. By what percentage has the rate risen during this burst?
Early in training a dog crosses the barrier 11 seconds after the shock begins. Once a tone has reliably preceded the shock, the dog crosses 7 seconds before the shock would have begun. By how many seconds has the response moved earlier?
In a contingency experiment the unconditioned stimulus follows the tone on 82 percent of trials on which the tone is presented, and also occurs on 35 percent of the intervals in which no tone is presented. What is the contingency, measured as the difference between the two probabilities in percentage points?
7C. Biological Predispositions and Instinctive Drift
Of 110 rats given a novel flavoured water followed 6 hours later by illness, 94 percent refused that flavour when it was offered again, after a single pairing. How many rats formed the aversion?
Children who watched a model punished for aggression produced a mean of 9 imitative aggressive acts in free play. When the same children were then offered an incentive to show what the model had done, the mean rose to 23 acts. By what percentage did the incentive raise their performance?
7C. Mirror Neurons, Vicarious Emotion and Applications
Of 687 neurons recorded in the premotor cortex of a macaque, 19 percent discharged both when the animal grasped an object itself and when it watched the experimenter grasp one. How many neurons showed that property?
Attitude change produced by careful examination of the arguments retains 79 percent of its initial size after six months, while change produced by a celebrity endorsement retains 20 percent. How many times more durable is the first?
In a model of self-efficacy, four sources are weighted to a total of 100 points. Mastery experience is given 53 points, vicarious experience 22 points and verbal persuasion 17 points. How many points are left for the reappraisal of physiological arousal?
Immediately after hearing a message from a source with poor credibility, 29 percent of an audience agreed with its conclusion. Four weeks later, with no further exposure, 54 percent agreed. By how many percentage points did agreement rise?
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7C. Social Cognitive Theory and Behavior Change