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zoom RSS 注意欠陥障害の子どもは雑音があると記憶力が改善/ADHD

<<   作成日時 : 2010/10/05 21:05   >>

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 授業中の雑音(white noise)により注意欠陥障害の子どもは授業がうまくできるようになるという。一方、雑音は正常な注意力のある子どもには反対の効果があり、クラスでの成績も悪化した。
 しかし、雑音は多動に対しての効果はなかった。
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White Noise May Boost Attention in Children
White Noise During Class Improves Attention at School, Study Showed
http://abcnews.go.com/Health/MindMoodNews/white-noise-boost-attention-children/story?id=11767917
By CHARLES BANKHEAD
MedPage Today Staff Writer

Inattentive schoolchildren performed significantly better when white noise was played during class, results of a small study showed.

The background noise had the opposite effect on normally attentive children, whose classroom performance deteriorated.

The study produced no evidence that background noise had a beneficial effect on hyperactivity, investigators reported online in Behavioral and Brain Functions.

Read this story on www.medpagetoday.com.

"This finding could have practical applications, offering noninvasive and nonpharmacological help to improve school results in children with attentional problems," Go"ran B.W. So"derland of Stockholm University in Sweden said in a statement.

A large volume of experimental and clinical evidence has demonstrated that cognitive processing is readily disturbed by distracting environmental stimuli. Some people, such as individuals with attention deficit/hyperactivity disorder (ADHD), are especially vulnerable to distraction, the authors noted.

However, some investigators have reported contradictory findings, showing that certain task-irrelevant noise can improve performance in children with attention deficits.

The explanation for the paradoxical effects of background noise remains unclear. One line of thought holds that background stimulation leads to increased arousal, which counteracts boredom.

Another model relies on principles of stochastic resonance, or noise-improved signaling, the authors continued. Detection of sensory signals offers one example. A weak signal or tone stimulus that is below the hearing threshold becomes detectable when random noise is added to the signal.

The theory of stochastic resonance also holds that the effects vary among individuals. The differences are linked to attention ability and neurotransmission in such a way that inattentive people require more external noise for proper cognitive function, the authors added.

ADHD is distinguished by low tonic dopamine levels that result in excessive reactivity to environmental stimuli. The moderate-brain-arousal model suggests that the dopamine-poor brain requires higher input noise to function to full potential. External white noise might compensate for behavior dysfunction related to impaired dopamine transmission.

Extending research into the association between noise and cognitive performance, the authors examined the effects of white noise on performance in a normal group of children who differed in their attentiveness.

The study involved 51 secondary-school students, whose classroom attention level had been rated by teachers. The students completed a verbal-recall test with and without the presence of auditory background noise.

The authors found a statistically significant positive correlation between attention and noise. Moreover, they found that the positive effect of noise increased with a student's inattention score and the negative effect increased with higher scores for attention.

The analysis also showed a significant negative correlation between reading skill and a positive effect of noise, a positive correlation between attention and reading ability, and a positive correlation between teacher-rated inattention and hyperactivity. The authors found no correlation between hyperactivity and noise-effect.

"Our data show that auditory white noise may exert potentially similar effects on cognition as medication through the phenomenon of stochastic resonance," the authors wrote in their discussion. "White noise is characterized by randomness and so introduces variability in the nervous system. A poorly tuned neural system benefits from additional white noise."

The authors noted that one limitation of the study is that only two levels of noise were evaluated. "One prediction from our model is that in [the] attentive group, a subset of participants will benefit from noise when levels are individually adjusted," they noted.

Another limitation is that only one test of cognitive ability was given, and it is not known if the effects would generalize to other cognitive measures.

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The effects of background white noise on memory performance in inattentive school children

Goran B. W. Soderlund email, Sverker Sikstrom email, Jan M. Loftesnes email and Edmund J. Sonuga-Barke email

Behavioral and Brain Functions 2010, 6:55doi:10.1186/1744-9081-6-55
Published: 29 September 2010
Abstract (provisional)

Background

Noise is typically conceived of as being detrimental for cognitive performance; however, a recent computational model based on the concepts of stochastic resonance and dopamine related internal noise postulates that a moderate amount of auditive noise benefit individuals in hypodopaminergic states. On the basis of this model we predicted that inattentive children would be enhanced by adding background white noise while attentive children's performance would deteriorate.
Methods

Fifty-one secondary school pupils carried out an episodic verbal free recall test in two noise conditions. In the high noise condition, verb-noun sentences were presented during auditory background noise (white noise, 78 dB), and in the low noise condition sentences were presented without noise.
Results

Exposure to background noise improved performance for inattentive children and worsened performance for attentive children and eliminated episodic memory differences between attentive and inattentive school children.
Conclusions

Consistent with the model, our data show that cognitive performance can be moderated by external background white noise stimulation in a non-clinical group of inattentive participants. This finding needs replicating in a larger sample using more noise levels but if replicated has great practical applications by offering a non-invasive way to improve school results in children with attentional problems.

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