Reduced Dementia

• Hong Kong researchers found in a 2006 study that participants with a median age of over 83 years who met a Diagnostic and Statistical Manual of Mental Disorders IV (DSM-IV) diagnosis of dementia significantly improved after playing mahjong twice or four times per week over the course of 16 weeks. This was true for players in both experimental groups, regardless of the frequency of play. The study also showed that the effects lasted even a month after mahjong play stopped, demonstrating that the positive cognitive effects of mahjong are powerful and long-lasting after participants have reached a certain threshold of improvement.

Lower Risk of Dementia

• Mahjong not only reduces dementia already affecting patients, but additional studies show that mahjong reduces the risk of ever developing it in the first place. Research on different varieties of cognitive games demonstrates that those who regularly do crossword puzzles or play strategic and mentally stimulating games like bridge and mahjong have a far lower risk of developing dementia compared to their peers who perform non-stimulating activities like watching television.

Verbal Memory

• Mahjong is a visual game, and players need not be able to read or understand the Chinese characters written on the playing tiles in order to benefit from its positive cognitive effects. Interestingly, though mahjong does not necessarily involve reading or speaking, playing it improves verbal memory for players of all nationalities. Verbal memory refers to the ability to remember words and other abstracted concepts from language (like syntax). The 2006 Hong Kong study found that verbal memory was improved moderately to significantly for participants who played mahjong on a regular weekly basis.