Hugdahl K, Andersson L
Cortex. 1986 Sep;22(3):417-32. doi: 10.1016/s0010-9452(86)80005-3.
The present study was concerned with the effects of directional attention on the right-ear-advantage (REA) in dichotic listening. It was suggested that if selective attention contributes to the REA during a non-forced, free recall condition, then comparing the unattended left and right ear scores when attention is forced to the right and the left ear, respectively, would yield an "attention-free" estimate of the REA. Each subject participated in a non-forced, free recall, condition; in a forced-right condition; and in a forced-left condition. During the two forced conditions, subjects were instructed to only attend to and report the right and left ear inputs, respectively. The stimuli were the six stop-consonants paired with the vowel a. Four right-handed groups participated (N = 18): Adult males, adult females, boys (8-9 years), girls (8-9 years). The results showed a significant REA in all groups during the non-forced condition. During the forced-right condition, significantly more correct recalls were obtained from the right compared to the left ear in all groups. During the forced-left condition, significantly more correct recalls from the left compared to the right ear was obtained only in the two adult groups, but not in the children groups. Finally, comparing correct recalls from the unattended right ear (during the forced-left condition) with the unattended left ear (during the forced-right condition) revealed a significant REA in all groups except for the adult females.
本研究关注的是定向注意对双耳分听中右耳优势（REA）的影响。研究表明，如果在非强制、自由回忆条件下选择性注意对右耳优势有影响，那么分别比较当注意力被强制指向右耳和左耳时未被注意的左耳和右耳的得分，将得出右耳优势的“无注意”估计值。每位受试者都参与了非强制、自由回忆条件；强制右注意条件；以及强制左注意条件。在两种强制条件下，受试者被分别指示只注意并报告右耳和左耳的输入。刺激材料是与元音a配对的六个塞音。四个右利手组参与了研究（N = 18）：成年男性、成年女性、男孩（8 - 9岁）、女孩（8 - 9岁）。结果显示，在非强制条件下所有组均存在显著的右耳优势。在强制右注意条件下，所有组从右耳获得的正确回忆显著多于左耳。在强制左注意条件下，只有两个成年组从左耳获得的正确回忆显著多于右耳，而儿童组则不然。最后，比较在强制左注意条件下未被注意的右耳的正确回忆与在强制右注意条件下未被注意的左耳的正确回忆，结果显示除成年女性组外所有组均存在显著的右耳优势。
