Scalp electroencephalograms (EEGs) were recorded from the prefrontal cortex in Japanese subjects while at rest and while playing computer games, and the subjects were classified into four types based on the β wave activity pattern. The games tested included tetris, action games, car race games, and the high-excitation-level role-playing games.
Normal-brain type : High β wave activity was recorded before these subjects started to play computer games, and the β wave activity showed no significant change even after subjects started to play the game. Visual-brain type : High β wave activity was recorded before the subjects started to play computer games, as in the normal-brain type subjects, but once the subject began to play, the activity of this wave decreased markedly. Semi-game- brain type : The resting β wave activity was already reduced to the level of the α wave activity, and the waveforms of the two overlapped. The semi-game-brain type subjects tended to be expressionless, forgetful and to show decreased concentration. Game-brain type : The resting β wave activity was consistently lower than the level of the α wave activity, or was even entirely undetectable. Persons of this type often reported, “I get into a rage (kireru) easily”. Many of these subjects also reported spending prolonged periods of time in a blank state of mind and finding it difficult to concentrate on anything. Many were also forgetful, unpunctual and often absent from school.
We investigated the effects of role-playing games on the β wave activity of a game-brain type subject. Even in the game-brain type subjects, playing of a role-playing game resulted in increased β wave activity up to the level noted in normal-brain type subjects. However, the β wave activity started to decline after the second round was played, and returned to the baseline game-brain type state by the fourth round.
The semi-game-brain type subjects showed an EEG pattern resembling that seen in patients with dementia.
Our data show that playing computer games results in depression of the neuronal activities of the prefrontal cortex. A game-brain type subject recovered to the visual-brain type after tossing three beanbags for 5 minutes a day continuously for six months. The β wave activity decreased markedly as soon as the subject started to play a computer game, and returned to the baseline level at the end of the game. This result shows that game-brain type subjects may benefit from exercises, such as tossing of three beanbags.
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