Which of the following is NOT a symptom of a manic episode according to DSM-5?

In the context of a manic episode as defined by the DSM-5, the correct answer identifies an aspect that does not align with the typical symptoms associated with mania. A manic episode often features symptoms such as inflated self-esteem or grandiosity, which contributes to the individual feeling invincible or superior to others.

Flight of ideas, characterized by a rapid flow of thoughts and a sense of racing ideas, is a hallmark symptom of mania. Similarly, engaging in excessive involvement in high-risk activities is a behavior frequently observed during manic episodes, as individuals may take on risky ventures without considering the potential consequences.

In contrast, the inability to concentrate is not a defining symptom of mania. In fact, individuals experiencing a manic episode may feel they have heightened focus on their ideas, although they can also become easily distracted by their racing thoughts. This can create an impression of poor concentration; however, the inability to concentrate is more characteristic of depressive episodes rather than mania. Therefore, the identification of the inability to concentrate as not being a symptom of a manic episode aligns accurately with the diagnostic criteria established in the DSM-5.