Perceptual load, voluntary attention, and aging: an event-related potential study.
Perceptual load, voluntary attention, and aging: an event-related potential study.
复制标题
DOI：
10.1016/j.ijpsycho.2012.01.002
复制
发表时间：
2012-04
影响因子：
3
通讯作者：
Parasuraman, Raja
中科院分区：
文献类型：
--
作者：
Wang, Yan;Fu, Shimin;Greenwood, Pamela;Luo, Yuejia;Parasuraman, Raja
注意选择的轨迹是已知的知觉负荷而变化。在自愿注意下，知觉负荷在早期皮质阶段调节选择性视觉加工，这反映在事件相关电位（ERP）的后P1和N1成分中。成年人的衰老也会影响注意力选择的行为和ERP信号。然而，它是不知道是否知觉负荷调制这种关系。因此，在本研究中，在自愿注意任务中记录了ERPs。年轻人和老年人被要求辨别一条目标线的方向，这条目标线嵌入在出现在左视野或右视野的四条线中。受试者对有效试验和低负荷试验的反应更快、更准确。在所有条件下，老年参与者的反应都比年轻参与者慢，准确性也低。在所有条件下，有效试验的后对侧P1和N1分量的振幅均大于无效试验。高负荷时N1波幅大于低负荷时。此外，在高知觉负荷条件下，老年组比年轻组在对侧部位有更大的N1。研究结果表明，在自愿注意下，知觉负荷和老化在N1（120- 200 ms）时间范围内调节注意选择，但不是最早的阶段。老年人N1振幅的增加可能反映了在高感知负荷下对目标识别的需求增加。
The locus of attentional selection is known to vary with perceptual load. Under voluntary attention, perceptual load modulates selective visual processing at an early cortical stage, as reflected in the posterior P1 and N1 components of the event-related potentials (ERPs). Adult aging also affects both behavioral and ERP signs of attentional selection. However, it is not known whether perceptual load modulates this relationship. Accordingly, in the present study ERPs were recorded in a voluntary attention task. Young and old participants were asked to discriminate the direction of a target line embedded within a display of four lines that appeared in the left or right visual field. Participants responded faster and more accurately to valid relative to invalid trials and to low-load relative to high-load condition. Older participants responded more slowly and with lower accuracy than young participants in all conditions. The amplitudes of the posterior contralateral P1 and N1 components in valid trials were larger than that in invalid trials in all conditions. N1 amplitude was larger under the high load condition than that in the low load condition. Moreover, in the high perceptual load condition, the old group had a larger N1 than the young group at contralateral sites. The findings suggest that under voluntary attention, perceptual load and aging modulates attentional selection at an early but not the earliest stage, during the N1 (120–200ms) time range. Increased N1 amplitude in older adults may reflect increased demands on target discrimination in high perceptual load.
登录
查看更多内容
影响因子：
2.6
作者：
Curran, T;Hills, A;Strauss, ME
通讯作者：
Strauss, ME
影响因子：
4.2
作者：
DUSTMAN, RE;SNYDER, EW
通讯作者：
SNYDER, EW
DOI：
10.1016/0013-4694(90)90138-a
发表时间：
1990-06-01
期刊：
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
影响因子：
--
作者：
HEINZE, HJ;LUCK, SJ;HILLYARD, SA
通讯作者：
HILLYARD, SA
影响因子：
3.2
作者：
GRADY, CL;HAXBY, JV;HERSCOVITCH, P
通讯作者：
HERSCOVITCH, P
影响因子：
4.7
作者：
Doallo, S;Lorenzo-López, L;Cadaveira, F
通讯作者：
Cadaveira, F