Before revision: The success of the hypothesis has led to modifications in existing theories, such as Wagner's SOP and the Rescorla-Wagner model, enabling them to explain such phenomena as retrospective reevaluation, but others such as counteraction still pose difficulties for most models.
After revision: The success of the hypothesis has led to modifications in existing theories, such as Wagner's SOP and the Rescorla-Wagner model, enabling them to explain such phenomena as retrospective reevaluation, but other phenomena such as counteraction still pose difficulties for most models.