Predicting what and when across saccades: Evidence from the extrafoveal preview effect
David Melcher1,2,3, Michele Deodato1,4
1Psychology Program, Division of Science, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.
Trans-saccadic preview benefits rely on predicting both the visual content and timing of the next fixation. This sensorimotor prediction mechanism is crucial for efficient post-saccadic visual processing.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Oculomotor Control
Background:
- Information outside the fovea guides saccadic eye movements.
- Trans-saccadic previews, or information about upcoming targets, enhance post-saccadic processing efficiency.
Purpose of the Study:
- Investigate the underlying mechanisms of trans-saccadic preview effects.
- Determine the role of visual content and timing in preview benefits.
Main Methods:
- Utilized a gaze-contingent preview paradigm with face stimuli.
- Manipulated preview validity (valid vs. invalid) and introduced a blank gap before target presentation.
Main Results:
- A preview benefit was observed when the face stimulus remained consistent.
- The introduction of a blank gap eliminated the preview effect, regardless of stimulus consistency.
Conclusions:
- Trans-saccadic preview effects depend on sensorimotor predictions of both the 'what' (content) and 'when' (timing) of the next fixation.
- Evidence supports an active, predictive mechanism underlying trans-saccadic perception.
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