During the fourth trial-block negative corroborations upon Cl and D1 did not lead to a change in response to Bl.
In the fourth trial-block, Bl is the only stimulus that receives key-presses, now in large numbers, followed by negative corroboration. All the other stimuli neither elicited key-presses nor did they get negative corroborations.
Table 3 contains participants' data from arrangement A for both transfer tests and subsequent trials registering verbal estimations about the tone contingency, and also the corroboration trials run in extinction for stimulus classes 1 and 2.
During corroboration trials however, the first negative corroboration to D1 seems to have led to a change in her subsequent "negative" estimation (N) to the next stimulus Cl, yet still "avoiding" the "presumed tone" as manifested by the key presses (i.e., still demonstrating derived discriminative responding).
The estimation given to all class 1 stimuli suggesting the presence of the tone was constant during the fourth trial-block, thus, obtaining a negative corroboration for each.
Instead of receiving the last three corroboration trial-blocks, she had three additional estimation trial-blocks, except for these being run in extinction in which the tone contingency was not operating.
4 Shows arrangement B participants' performance during the 1st and 2nd trial tests for transfer, 3rd trial for estimation and 4th, 5th and 6th trial for corroboration. Comparison participant 12 did not received corroboration trials.
In the fourth trial-block, D1 was the first stimulus followed by a negative corroboration. This seems to have led only to a change in the estimation given to C1.
A positive estimation, followed by its corresponding negative corroboration, occurred for B1 during this and the next trial-block.
The work discusses topics such as eye witness testimony, evaluating conflicting evidence, false corroborations
problems, and probability, and applies these assessment techniques to the narratives of popular Kennedy conspiracy theories.