Final answer:
Catherine is likely to overestimate the effectiveness of her psychotherapy due to the hindsight bias, which makes people view past events more positively after they have occurred.
Step-by-step explanation:
If you ask Catherine next month how effective her psychotherapy was, she is likely to overestimate its effectiveness. This phenomenon can occur due to a cognitive bias known as the hindsight bias, where people tend to view past events in a more positive light after they have occurred. Individuals often believe that their efforts were worth it and that the experience had a significant positive impact, even if outcomes were unremarkable at the time. Such a perspective is particularly common in situations involving substantial emotional, financial, or time investments, like undergoing long-term therapy.