Improving intelligence through cognitive training
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Cognitive Training and Intelligence Improvement: Evidence and Controversies
Effectiveness of Cognitive Training on Intelligence and Cognitive Abilities
Research shows that cognitive training can lead to improvements in specific cognitive skills, such as working memory, executive functions, and processing speed, especially when training programs are comprehensive and target multiple cognitive domains. Large-scale studies have found that participants who engage in varied cognitive training exercises show greater improvements in neuropsychological performance, including speed of processing, short-term memory, working memory, problem solving, and fluid reasoning, compared to control groups doing activities like crossword puzzles . These improvements can also extend to self-reported measures of cognitive functioning, particularly concentration .
Meta-analyses and systematic reviews confirm that cognitive training, especially computerized programs targeting executive functions, can produce significant immediate and long-term gains in trained tasks and some transfer to similar untrained tasks (near-transfer), as well as small improvements in general cognitive performance (far-transfer) Nguyen2019Smid2020. However, the effects on broader measures of intelligence, such as fluid intelligence, are often small or inconsistent, and may not always be statistically significant after accounting for publication bias Nguyen2019Rodas2024.
Transfer Effects: Near vs. Far Transfer
A key debate in the field is whether cognitive training leads to improvements beyond the specific tasks that are trained. While it is well established that training improves performance on the tasks practiced (near transfer), evidence for far transfer—improvements in unrelated cognitive tasks or general intelligence—is mixed Owen2010Von Bastian2022Smid2020. Some studies report that working memory training can lead to gains in fluid intelligence, and that the amount of training (dosage) is important for the extent of improvement Jaeggi2011Jaeggi2008. However, other large studies have found no evidence for transfer to untrained tasks, even when those tasks are closely related to the ones practiced Owen2010Von Bastian2022.
Individual Differences and Training Conditions
The effectiveness of cognitive training can depend on individual differences. For example, children who show greater improvement on training tasks are more likely to experience gains in untrained cognitive abilities, and these gains can persist for months after training ends . This suggests that not everyone benefits equally from cognitive training, and future research should focus on identifying which training regimens and conditions work best for different individuals Jaeggi2011Smid2020.
Mechanisms and Limitations of Cognitive Training
Recent reviews highlight that cognitive training is more likely to enhance cognitive efficiency—how well someone uses their existing cognitive resources—rather than increasing overall cognitive capacity . Improvements are often most pronounced when the assessment tasks are similar to the training tasks, raising concerns about measurement bias and the true extent of generalization . Additionally, characteristics of the training program, such as the type and amount of training, do not always predict effectiveness, and methodological issues like randomization and selective reporting can influence results .
Enhancing Training Outcomes: Combined Approaches
Some studies have explored combining cognitive training with brain stimulation techniques, such as transcranial direct current stimulation (tDCS), to boost training effects. These combined approaches have shown promise in enhancing fluid intelligence when compared to training alone, suggesting that integrating multiple methods may yield better outcomes .
Policy and Practical Implications
While there is guarded optimism about the potential of cognitive training to enhance intelligence and related abilities, more rigorous research is needed before widespread adoption in educational or clinical settings can be recommended. Policymakers and researchers are encouraged to promote best practices, consider ethical issues, and focus on developing adaptive, multidomain training programs that are tailored to individual needs Green2020Smid2020.
Conclusion
Cognitive training can improve specific cognitive skills and, in some cases, lead to small gains in broader cognitive abilities like fluid intelligence. However, the evidence for far transfer and general intelligence improvement is mixed, with individual differences and methodological factors playing important roles. Future research should focus on understanding the mechanisms of training, identifying who benefits most, and developing more effective, personalized interventions.
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