Balconi Michela, Sozzi Matteo, Ferrari Chiara, Pisani Luigi, Mariani Claudio
Department of Psychology, Catholic University of Milan, Largo Gemelli, 1, 20123, Milan, Italy.
Cogn Process. 2012 Aug;13 Suppl 1:S89-92. doi: 10.1007/s10339-012-0465-9.
The present study explored behavioral and eye-movement measures in unilateral neglect patients in response to online bisection task (unfilled gap line). Two different tasks supported the bisection performance, a pointing and a grasping strategy. It was explored whether these different strategies may influence subjects' behavioral and eye-movement measures in response to different segment features: segment length (from shorter to longer) and segment spatial dislocation (from right to left spatial location). Consistent spatial biases were found for both bisection responses, fixation count, and duration, as well as for the first fixation count in case of pointing task. An "extreme-left" gradient effect was suggested and discussed, with patients' behavioral and eye measures more impaired. On the contrary, the patients' performance overlaps with the controls' one in case a grasping task. The direct link of visual pointing and grasping strategy, respectively, with the two cortical ventral and dorsal pathways was adduced to explain our results.
本研究探讨了单侧忽视患者在应对在线二等分任务（未填充间隙线）时的行为和眼动测量。两种不同的任务支持二等分表现，即指向策略和抓握策略。研究了这些不同策略是否会影响受试者在应对不同线段特征时的行为和眼动测量，这些特征包括线段长度（从短到长）和线段空间错位（从右到左空间位置）。在二等分反应、注视次数和持续时间以及指向任务中的首次注视次数方面均发现了一致的空间偏差。提出并讨论了一种“最左侧”梯度效应，即患者的行为和眼动测量受损更严重。相反，在抓握任务中，患者的表现与对照组的表现重叠。视觉指向和抓握策略分别与两条皮质腹侧和背侧通路的直接联系被用来解释我们的结果。
