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Too slow to see? Conscious vision and real-time behavior
Valtteri Arstila1, Henry Railo2
1Department of Philosophy, Contemporary History and Political Science, University of Turku, Turku, Finland valtteri.arstila@utu.fihttps://valtteriarstila.net/.
The Behavioral and Brain Sciences
|June 24, 2026
Summary
Conscious vision can guide real-time actions, emerging around 200 ms post-stimulus. This challenges claims that conscious perception is too slow, highlighting its functional relevance for behavior.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Action Guidance
Background:
- Fleming and Michel proposed that conscious vision is too slow for real-time action.
- This claim relies on specific interpretations of postdiction effects and unconscious vision.
- The speed and functional role of conscious perception remain debated.
Purpose of the Study:
- To challenge the assertion that conscious vision is inadequate for real-time behavioral control.
- To present evidence supporting the rapid emergence of conscious perception.
- To re-evaluate the functional significance of conscious versus unconscious visual processing.
Main Methods:
- Review and analysis of correlative evidence regarding visual processing timelines.
- Examination of functional data linking conscious perception to behavioral outcomes.
- Critique of methodologies and assumptions in prior studies on vision speed.
Main Results:
- Correlative and functional data indicate conscious perception can manifest approximately 200 ms after stimulus onset.
- This timeframe is sufficient for conscious perception to influence and guide behavior.
- Previous underestimations of conscious vision speed stem from focusing on rare postdiction effects.
Conclusions:
- Conscious vision is sufficiently rapid to guide real-time actions.
- The functional relevance of unconscious vision may be overestimated.
- Fleming and Michel's claims regarding the limitations of conscious vision are challenged by current evidence.
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