Centre for Brain Research and School of Psychology, University of Auckland, New Zealand.
Centre for Brain Research and School of Psychology, University of Auckland, New Zealand.
Conscious Cogn. 2019 Sep;74:102783. doi: 10.1016/j.concog.2019.102783. Epub 2019 Jul 18.
Dorsal stream visual encoding was studied in three experiments, by examining effects of peripheral landmark cues on eye movements. Stimulus features and task structure were tailored to physiological and functional characterisations of the dorsal visual stream. Sub-discriminable peripheral stimuli served as landmark cue stimuli. In Experiments 1 and 2, orienting behaviour in response to cues and targets differed for participants with relatively low and relatively high peripheral contrast thresholds. In Experiment 1, low, but not high-threshold participants oriented towards landmark cues that could not be discriminated consciously. However, in Experiment 3, high-, but not low-threshold participants oriented towards near threshold cues. Hence, under appropriate conditions both groups of participants oriented in response to brief, low-contrast, peripheral information. We propose that landmark cueing may provide a useful tool for measuring individual differences in dorsal stream processing and dynamic aspects of visual functioning and awareness.
在三个实验中研究了背侧流的视觉编码，通过检查外周地标线索对眼球运动的影响。刺激特征和任务结构是根据背侧视觉流的生理和功能特征量身定制的。可区分的亚刺激作为地标线索刺激。在实验 1 和实验 2 中，对线索和目标的定向行为因外周对比阈值相对较低和相对较高的参与者而有所不同。在实验 1 中，只有低阈值的参与者会对无法有意识地分辨的地标线索做出定向反应。然而，在实验 3 中，只有高阈值的参与者会对接近阈值的线索做出定向反应。因此，在适当的条件下，两组参与者都会对短暂的、低对比度的、外周信息做出定向反应。我们提出地标提示可能是一种有用的工具，可以衡量背侧流处理和视觉功能及意识的动态方面的个体差异。
