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Neuroscience

Time^2: A framework for the neural dynamics of visual perception

Laurent Caplette, Frédéric Gosselin

Featured August 11, 2026

Original Paper

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Simply

The paper introduces a new way to see how our brain processes what we see by tracking both *when* we look at something and *how long* our brain takes to understand it, using Time$^2$ maps to reveal hidden patterns.

In depth
The paper introduces Time$^2$, a novel reverse correlation framework that simultaneously measures two critical temporal facets of visual perception: stimulus time (when visual information is received on the retina) and processing time (how long the brain takes to process that information). This method generates 2D maps that disentangle these previously conflated dimensions, allowing for a precise characterization of neural phenomena like rhythmic perception, predictive processing, and coarse-to-fine sampling.

Key Takeaways

  • 1
    The paper highlights that visual perception involves two distinct temporal dimensions—stimulus time and processing time—which are often conflated in existing literature, leading to incomplete models of vision.
  • 2
    The authors propose Time$^2$, a reverse correlation method that simultaneously measures both stimulus time and processing time, generating 2D maps to visualize how information received at each moment is processed across time in the brain.
  • 3
    This framework enables a precise characterization of complex neural phenomena, such as oscillatory sampling versus oscillatory processing, adaptive modulation, information maintenance, and the disentanglement of processing speed from stimulus moment in phenomena like coarse-to-fine processing.

Conceptual Flow

HIGH LEVEL
1
Methodology: Mapping Visual Perception in Two Times

The method creates noisy, flickering images and measures brain activity to figure out exactly when the brain uses information from each tiny moment of seeing.

Flickering Image
Brain Activity
Connect Moments to Responses
Map of Seeing Time vs. Brain Time
2
Results: Uncovering Neural Dynamics

This map shows if the brain processes things with a steady delay, or if it samples information in rhythmic bursts, or even predicts what's coming next.

Map of Seeing Time vs. Brain Time

Reveal Patterns

Steady Delay Pattern