Loneliness May Be a Strong Predictor of Cognitive Decline
Researchers pooled data from more than 175,000 adults over age 50 across 11 long-running studies in 18 countries, in work published in the Journal of Personality and Social Psychology. They found that loneliness — the felt sense of inadequate connection, not simply being alone — was consistently tied to cognitive impairment and earlier death, while social isolation on its own showed only weak links: a 10% increase in loneliness was associated with an 8–9% higher risk of severely impaired cognitive function. Because the study is observational, it shows an association rather than proving that loneliness causes decline.
Source: The Educated Patient
Positive Parenting Linked to Stronger Brain Reward Responses
Notre Dame psychologist Kaylin Hill followed 465 children for 15 years, coding parenting behavior when the children were 3 and measuring the brain's electrical response to rewards at ages 9, 12, 15, and 18 with EEG, in a study published in Communications Psychology. Children who experienced more warmth and encouragement — and less harshness — showed larger brain reward responses across adolescence, the period when depression risk peaks. The researchers note the study is observational, but it suggests early parent-child interactions may shape how the brain processes joy and pleasure.
Source: News-Medical
Neuroticism May Predict Lasting Mental Distress After a Crisis
USC researchers analyzed more than 100,000 survey responses from 4,030 U.S. adults tracked from 2019 through early 2024, covering the period before, during, and after the COVID-19 pandemic, in a study published in PLOS ONE on October 7, 2026. Adults in the top quarter for neuroticism — a tendency toward worry and emotional sensitivity — had 11 to 20 percentage-point greater increases in moderate-to-severe anxiety and depression symptoms, and the effect persisted well into the post-pandemic period. The authors caution that neuroticism is a risk factor, not a diagnosis, and the observational design cannot prove causation.
Source: ScienMag