none of the information-integration participants transferred a categorization strategy that was best described by an optimal model. As in Experiment 1, most of the information-integration participants guessed when transferred to the same–different categorization task (and more training led to more guessing).For the participants trained with the same–different task,only the participants in the 1D-Width condition produced a response pattern that could be described by an optimal strategy. Most of these participants were able to transfer their category knowledge when the task changed. In contrast,participants trained with the information-integration
or the conjunction rule category structures did not use an optimal categorization strategy (most of these participants were either guessing or using a one-dimensional rule). This is not surprising since the best performance that these participants were able to achieve was 53.2 and 56.8%(respectively; see Table 2). However, these participants were able to learn an appropriate categorization strategy
when they switched to the classification task. Note that, as in Experiment 1, the performance of none of the participants in any of the conditions was best fit by a similarity model.
To summarize, participants trained with the 1D-Width category structure could learn, use and transfer their category knowledge regardless of the training/transfer task. In
contrast, participants trained with the information-integration category structure could only learn and use an optimal strategy in the direct classification task, and no transfer of category knowledge was observed. Finally, participants
trained with the conjunction rule could learn, use and transfer their category knowledge when trained with the direct classification task. However, an optimal decision strategy could not be learned/transferred when trained with
the same–different categorization task. Still, an optimal strategy could be used in the same–different categorization task if it was previously learned in a direct classification task.