Sub-threshold cuing: Saccadic responses to low-contrast,peripheral, transient visual landmark cues |
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Institution: | 1. Department of Psychology, National Taiwan University, Taipei 106, Taiwan;2. Center for Neurobiology and Cognitive Science, National Taiwan University, Taipei 106, Taiwan;3. Department of Psychiatry, Yale University, New Haven, CT 06511, USA;4. Department of Neurobiology, Yale University, New Haven, CT 06511, USA;5. Interdepartmental Neuroscience Program, Yale University, New Haven, CT 06511, USA;1. The University of Alabama at Birmingham Department of Psychology, Birmingham, AL 35294, USA;2. The University of Alabama at Birmingham Department of Neurobiology, Birmingham, AL 35294, USA |
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Abstract: | 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. |
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Keywords: | Vision Attention Landmark cuing Dorsal visual stream Visual orienting Consciousness |
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