Department of Psychology, New York University, New York, NY, USA.
Center for Neural Science, New York University, New York, NY, USA.
Nat Hum Behav. 2021 Oct;5(10):1418-1431. doi: 10.1038/s41562-021-01099-4. Epub 2021 Apr 19.
Perception and action are tightly coupled: visual responses at the saccade target are enhanced right before saccade onset. This phenomenon, presaccadic attention, is a form of overt attention-deployment of visual attention with concurrent eye movements. Presaccadic attention is well-documented, but its underlying computational process remains unknown. This is in stark contrast to covert attention-deployment of visual attention without concurrent eye movements-for which the computational processes are well characterized by a normalization model. Here, a series of psychophysical experiments reveal that presaccadic attention modulates visual performance only via response gain changes. A response gain change was observed even when attention field size increased, violating the predictions of a normalization model of attention. Our empirical results and model comparisons reveal that the perceptual modulations by overt presaccadic and covert spatial attention are mediated through different computations.
在眼球运动开始之前，眼球运动目标处的视觉反应得到增强。这种现象，即眼跳前注意，是一种明显的视觉注意力部署形式，伴随着眼球运动。眼跳前注意已经得到了充分的记录，但它的底层计算过程仍然未知。这与没有眼球运动的隐蔽注意力部署形成鲜明对比——对于后者，其计算过程已经通过归一化模型得到了很好的描述。在这里，一系列心理物理学实验表明，眼跳前注意仅通过响应增益变化来调节视觉性能。即使注意域大小增加，也会观察到响应增益的变化，这违反了注意力归一化模型的预测。我们的实验结果和模型比较表明，显性眼跳前和隐蔽空间注意力的知觉调制是通过不同的计算来实现的。
