Which of the following is NOT an explanation for the blocking effect in the following example: Early in training A is paired with outcome X, then late in training A and B are paired with X, and C and D are paired with Y. At the final test phase, B and D are shown and outcome Y is selected.

Question

BlackTom AI · Accepted Answer

To assess the blocking explanation in this scenario, I’ll go option by option and articulate how each would account for the observed data, or fail to.
Option 1: 'After learning that A predicts X, there is little associative strength left over for learning the connection between B and X.' This aligns with the classic blocking effect. Once A already predicts X, the learning system assigns most of the predictive value to A, leaving B with little left to learn about X despite B being paired with A in AB trials. Thus, this explanation correctly accounts for reduced or blocked learning for B–X.
Option 2: 'A is assumed to already predict outcome X on the basis of the Einstellung Effect.' The Einstellung Effect refers to a problem-solving phenomenon where a familiar solution blocks the discovery of a novel approach, not a standard mechanism in classical conditioning or error-driven learning about cue-outcome associations. In the context of blocking, attributing A’s predictive status to the Einstellung Effect is not a conventional or empirically supported account of why B fails to acquire strong associations with X. Therefore, this explanation is not appropriate for explaining the blocking effect in this paradigm.
Option 3: 'B and D are paired with their respective outcomes with equal frequency.' If B and D were learned about with equal frequency to their outcomes (X for B, Y for D) throughout training, we would not expect a blocking pattern for B in AB trials because B would have had substantial opportunities to form an association with X. Equal-frequency pairing would reduce the distinct blocking effect, making this explanation inconsistent with the observed block on B–X learning. Hence, this does not explain the blocking phenomenon here.
Option 4: 'People learn to selectively attend to cue A early in training. This leaves little attention left over for cue B late in training.' An attention-based account is another widely discussed mechanism for blocking. If attention is preferentially allocated to A early on, B receives diminished processing on AB trials, reducing associative learning about B and X. This explanation captures a plausible cognitive process contributing to blocking and matches the observed pattern, making it a viable explanation.
In summary, options 1 and 4 describe mechanisms compatible with blocking (associative strength allocation and attentional limitation, respectively), option 3 predicts no robust blocking under equal exposure, and option 2 invokes a nonstandard, less applicable theoretical notion (Einstellung Effect) that does not typically explain blocking in this conditioning paradigm. The overall assessment reveals that the statement naming the Einstellung Effect as the basis for A predicting X is not a correct explanation for the blocking phenomenon in this example.

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