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Characterising the visual buffer: real-world evidence for overwriting early in each fixation
1Sussex Centre for Neuroscience, School of Biological Sciences, University of Sussex, Brighton, UK. b.w.tatler@sussex.ac.uk
Perception
|October 2, 2001
Summary
Visual perception relies on current snapshots, not a continuous stream. New visual information overwrites old data within milliseconds, explaining why we miss changes during eye movements (saccades).
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Observers exhibit significant 'change blindness,' failing to detect alterations in scenes across saccades and blinks.
- Prior research suggests visual snapshots from retinal fixations are not retained or fused over time.
Purpose of the Study:
- To investigate the fate of pictorial content across successive eye fixations during a complex task.
- To determine if visual information from prior fixations is accessible.
Main Methods:
- Volunteers performed a real-life task (making tea) while their visual processing was assessed.
- The study analyzed participants' ability to recall information from current versus previous fixations.
Main Results:
- Participants could access the visual snapshot of their current fixation.
- Information from previous fixations was not accessible.
- Visual snapshots are stored in a low-level buffer and are overwritten in an all-or-none fashion within 400 ms.
Conclusions:
- Visual perception relies on a buffer storing veridical snapshots of the current fixation.
- This buffer is not cleared by saccades but is overwritten by new visual input.
- The overwrite process is rapid, with 50% occurring within 100 ms of a new fixation.