Volume 2 Issue 1, January 2023

PhD training in psychology asks people to receive training while simultaneously executing the essential work of a university. A healthy PhD approach that places student wellbeing ahead of productivity is a counterweight to these conditions.

People feel lonely when their social needs are not met, which can lead to long-term health issues. In this Review, Luhmann et al. summarize empirical findings on differences in the prevalence of loneliness across time and space and consider macro-level factors that might account for these differences.

Post-traumatic stress disorder and substance use disorder frequently co-occur, and this combination is more difficult to treat than either disorder alone. In this Review, Kline and colleagues discuss effective treatments for this combination, focusing on trauma-focused treatments, and provide recommendations to improve treatment response and reduce dropout.

Remembering to execute in the future an intention that cannot be fulfilled when formed in the present is an essential cognitive skill. In this Review, Rummel and Kvavilashvili discuss how well theories of prospective memory account for the cognitive processes involved.

Philosophers of science have identified epistemological criteria for evaluating the promise of a scientific theory. In this Perspective, Dale et al. propose that a principle of methodological variety should be one of these criteria, and argue that psychologists should actively cultivate methodological variety to advance theory.