Sustained focal attention and peripheral letter recognition
Sustained focal attention and peripheral letter recognition
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DOI：
10.1163/156856899x00030
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发表时间：
1999-01-01
期刊：
影响因子：
--
通讯作者：
Mackeben, M
中科院分区：
文献类型：
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作者：
Mackeben, M
周边字母识别的地形特征进行了研究，使用持续的注意力范式，以澄清其部署在视野中是否同样容易在所有8个测试位置在7.5度偏心。目标大小（36弧分）明显高于阈值，因此在长时间（> 500 ms）下很容易识别字母。在主实验中，他们被展示了66到167毫秒的时间，12个正常视力的受试者中有6个20多岁，其他人50多岁。目标位置被提示（Is），并且在2.5- 4s延迟之后，显示目标。结果提供了强有力的证据表明，性能显着依赖于位置和主题。所有的空间特征都表现为不对称，大多数表现为垂直不对称。水平子午线上的表现总是最好的。所有结果均与受试者年龄无关。这些发现还表明，在不利的位置，性能是有限的部署注意力，而不是保持在那里。因此，在双眼中央视野丧失后的低视力康复中，用于“偏心观察”的优选视网膜位点的选择可能受到与眼睛疾病无关的注意力因素的限制。
Topographic characteristics of peripheral letter recognition were investigated using a sustained attention paradigm to clarify whether its deployment in the visual field is equally easy in all eight tested locations at 7.5 deg eccentricity. Target size (36 arcmin) was clearly above threshold, so that letters were easily recognized at long durations (> 500 ms). In the main experiment, they were displayed for an individually determined duration of 66 to 167 ms. Six of twelve normally sighted subjects were in their twenties, the others in their fifties. The target location was cued (I s), and after 2.5-4 s delay, a target was displayed. The results provide strong evidence that performance depended significantly on location and subject. All spatial characteristics showed anisometry, and most showed vertical asymmetry of either sign. Performance was always best on the horizontal meridian. None of the results correlated with subject age. These findings also show that in disfavored locations, performance is limited by deploying attention there, not by holding it there. Consequently, in low vision rehabilitation after binocular central field loss, the choice of a preferred retinal locus for 'eccentric viewing' can be limited by an attentional factor that is unrelated to the eye disease.