Greene Harold H, Brown James M
University of Detroit Mercy, Detroit, Michigan, USA.
J Eye Mov Res. 2017 Mar 4;10(1). doi: 10.16910/jemr.10.1.5.
Real time simulation of visual search behavior can occur only if the control of fixation durations is sufficiently understood. Visual search studies have typically confounded pre- and post-saccadic influences on fixation duration. In the present study, pre- and post-saccadic influences on fixation durations were compared by considering saccade direction. Novel use of a gaze-contingent moving obstructer paradigm also addressed relative contributions of both influences to total fixation duration. As a function of saccade direction, pre-saccadic fixation durations exhibited a different pattern from post-saccadic fixation durations. Post-saccadic fixations were also more strongly influenced by peripheral obstruction than pre-saccadic fixation durations. This suggests that post-saccadic influences may contribute more to fixation durations than pre-saccadic influences. Together, the results demonstrate that it is insufficient to model the control of visual search fixation durations without consideration of pre- and post-saccadic influences.
只有当对注视持续时间的控制有足够的了解时，才可能进行视觉搜索行为的实时模拟。视觉搜索研究通常混淆了扫视前和扫视后对注视持续时间的影响。在本研究中，通过考虑扫视方向来比较扫视前和扫视后对注视持续时间的影响。注视点相关移动障碍物范式的新应用也探讨了这两种影响对总注视持续时间的相对贡献。作为扫视方向的函数，扫视前的注视持续时间与扫视后的注视持续时间呈现出不同的模式。与扫视前的注视持续时间相比，扫视后的注视受周边障碍物的影响也更强。这表明扫视后的影响可能比扫视前的影响对注视持续时间的贡献更大。总之，结果表明，在不考虑扫视前和扫视后影响的情况下，对视觉搜索注视持续时间的控制进行建模是不够的。
