Sequeira Sarah Dos Santos, Specht Karsten, Hämäläinen Heikki, Hugdahl Kenneth
Department of Biological and Medical Psychology, University of Bergen, Norway.
Scand J Psychol. 2008 Aug;49(4):305-10. doi: 10.1111/j.1467-9450.2008.00664.x. Epub 2008 May 16.
It has previously been shown that the right ear advantage in dichotic listening to consonant-vowel syllables is affected if a background noise is presented at the same time as the dichotic stimuli. What is not known is, however, if there is also an effect of varying the intensity level of the background noise. We therefore presented conversation or traffic noise background noise simultaneously with the dichotic syllable stimuli to healthy adult subjects. The intensity of the background noises varied between 50-65 dB in steps of 5 dB. The results showed that the right ear correct reports decreased, while left ear correct reports increased as a consequence of increasing background noise intensity. The effects were also stronger for the right ear, and for the traffic background noise condition, particularly at the two highest intensity levels. The results are discussed in terms of alertness and attentional mechanisms.
先前的研究表明，如果在双耳分听辅音-元音音节时同时呈现背景噪声，那么右耳优势会受到影响。然而，尚不清楚改变背景噪声的强度水平是否也会产生影响。因此，我们向健康的成年受试者同时呈现对话或交通噪声背景以及双耳分听的音节刺激。背景噪声的强度在50 - 65分贝之间以5分贝为步长变化。结果表明，随着背景噪声强度的增加，右耳正确报告减少，而左耳正确报告增加。这些影响在右耳以及交通背景噪声条件下也更强，尤其是在两个最高强度水平时。我们从警觉性和注意力机制方面对结果进行了讨论。
