Final answer:
Jun should engage in expressive writing soon after experiencing a situation that triggers his social anxiety, as it could help improve his short-term memory and allow him to process his feelings.
Step-by-step explanation:
According to Yogo and Fujihara's study on expressive writing and its effects on memory, it would be most beneficial for Jun to engage in this practice when writing about his severe social anxiety. The study suggests that writing about traumatic experiences has a positive impact on short-term memory, indicating that the same might apply to Jun's social anxiety. To help Jun, one should encourage him to write about his experiences in a private setting, describing them in as much detail as possible, preferably after he encounters a situation that triggers his anxiety. By doing so, Jun can not only potentially improve his memory but also process and understand his feelings, leading to better coping strategies.
His writing sessions should be consistent and uninterrupted, requiring him to focus solely on the act of writing for about 20 minutes. The timing of these sessions is crucial; ideally, Jun should engage in expressive writing soon after an anxiety-inducing event while the experience is fresh in his mind. This can help him to connect more deeply with his feelings and gain clarity on the issues that trigger his anxiety.