Brain Training Games Cut Dementia Risk 25% Over Two Decades, Study Finds

Katrina Barber on
Brain Training Games Cut Dementia Risk 25% Over Two Decades, Study Finds

Brain Training Games Cut Dementia Risk 25% Over Two Decades, Study Finds

Cherry Creek Lane News | March 20, 2026

Elderly person working on cognitive activities and puzzles

Table of Contents

Breakthrough 20-Year Study Results

A landmark study published in February 2026 reveals that older adults who completed cognitive speed training reduced their dementia risk by 25% compared to those who received no training, even two decades later. The research represents the first randomized clinical trial to demonstrate that any intervention can lower Alzheimer's disease and dementia incidence over such an extended period.

The findings come from the Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) study, which enrolled 2,802 adults beginning in 1998-99. Participants who received speed of processing training, plus booster sessions at 11 and 35 months, maintained protection against dementia diagnosis through their 90s.

What the Training Involved

The intervention consisted of just 10 sessions of 60-75 minutes over five to six weeks, with optional booster sessions. Participants who received the greatest benefit completed a maximum of 18 training sessions spread across three years. The training focused on processing visual information on computer screens and making quick decisions, with difficulty increasing as participants improved.

Researchers tested three types of cognitive training: memory, reasoning, and speed of processing. Only speed training participants showed the dramatic long-term reduction in dementia risk. Memory and reasoning training did not produce the same protective effects over the 20-year follow-up period.

Why Speed Training Works

Experts believe speed training may trigger implicit learning, which involves acquiring unconscious or automatic skills similar to riding a bicycle or swimming. This type of learning operates differently in the brain and produces more lasting effects than explicit learning.

The training was adaptive, meaning its difficulty changed based on performance. Participants who were faster at the start quickly moved to more challenging exercises. This adaptive feature was unique to the speed training group and may explain its superior long-term effects.

Speed training may also build cognitive reserve, the brain's ability to resist dementia effects. Cognitive reserve develops over time through education, mentally stimulating activities, and social engagement. The visual processing speed-based training appears to engage broader neural networks that build brain resilience.

Public Health Implications

New dementia cases are estimated to double by 2060, but approximately 45% of cases may be preventable through lifestyle changes. This study provides the first gold-standard evidence that cognitive training can be added to prevention strategies alongside exercise, healthy diet, and social engagement.

The research suggests that even small delays in dementia onset could have large public health impacts and help reduce rising healthcare costs. Participants ranged from 65 to 94 years old at enrollment, with no substantial reduction in training benefit based on age, indicating cognitive training can begin at any time.

Expert Recommendations

Johns Hopkins Alzheimer's Disease Research Center director Marilyn Albert described the findings as surprising and very exciting, noting the effects were not expected to persist 20 years after training. An ongoing study called Preventing Alzheimer's with Cognitive Training (PACT) has enrolled about 7,500 people age 65 and older to test whether increased training doses provide even greater benefits.

Researchers recommend that cognitive training be incorporated into multicomponent intervention programs for older adults, potentially paired with physical exercise, nutrition management, and hypertension control. Other activities associated with reduced cognitive decline include monitoring blood pressure, blood sugar, cholesterol, and body weight, along with regular physical activity.

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