Knowledge Centre

The review distinguishes wanting, experienced pleasure and learning in reward processing. Anhedonia may involve difficulties in some or several of these processes.

Limit: This is not an intervention meta-analysis. Conceptual distinctions do not imply that everyone has the same pattern.

This 2024 paper argues against treating habitual and goal-directed behaviour as two rigid categories. It distinguishes habit from compulsivity: automatic responding is not the same construct as persistence despite harmful consequences.

Limit: The meta-analysis concerns animal experiments; human studies are reviewed separately. The focus is alcohol use. Findings cannot be directly generalised to every substance, phone use or a particular person.

Among adults with depression and insomnia, cognitive behavioural therapy for insomnia (CBT-I) increased the likelihood of depression response compared with control conditions. Evidence certainty for this outcome was moderate.

Limit: Searches extended to March 2024. Findings do not generalise to every sleep difficulty or person and do not guarantee long-term recovery.

Behavioural activation is a structured psychotherapy approach supporting engagement in meaningful activities. The review suggests possible short-term benefit over usual care and no clear difference from CBT. This does not establish definite equivalence.

Limit: Searches ended in January 2020. Evidence was mostly low to moderate certainty; long-term outcomes remain uncertain. Some sensitivity analyses did not confirm the advantage over usual care.

Berridge and Robinson link dopamine-related motivation systems to wanting. Their account allows intense wanting without increased pleasure.

Limit: This theoretical framework does not explain every cause of addiction; it is not a personal prediction or intervention trial.

The review covers Marlatt’s model and later developments, considering context, coping and interpretations together.

Limit: Not the whole current literature or an individual risk calculation.