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Related Experiment Video

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Recording Light-evoked Postsynaptic Responses in Neurons in Dark-adapted, Mouse Retinal Slice Preparations Using Patch Clamp Techniques

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Gating of remote effects on lightness.

Paola Bressan¹, Peter Kramer

¹Dipartimento di Psicologia Generale, Università di Padova, Italy. paola.bressan@unipd.it

Journal of Vision

|March 6, 2008

Summary

This summary is machine-generated.

Grouping of visual elements dictates how distant light levels influence perceived lightness in the dungeon illusion. This study reveals how grouping controls these effects, supporting the double-anchoring theory of lightness perception.

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Area of Science:

Visual Perception
Psychophysics
Computational Neuroscience

Background:

The dungeon illusion demonstrates that target lightness is influenced by surrounding contextual elements.
Grouping between targets and contextual disks is a key factor in modulating lightness perception.

Purpose of the Study:

To investigate how grouping affects the influence of remote luminances on target lightness in the dungeon illusion.
To examine the conditions under which remote luminances become critical or irrelevant for lightness perception.

Main Methods:

Systematic variations of the dungeon illusion with different luminance configurations (double decrement, double increment).
Analysis of how grouping cues alter the perceived lightness of targets.
Testing predictions derived from the double-anchoring theory of lightness.

Main Results:

Grouping determines whether remote luminances affect target lightness.
The dungeon illusion reverses under double-decrement and double-increment conditions.
Grouping acts as a gate, directing the influence of remote luminances in opposite directions in inverted versions of the illusion.

Conclusions:

Results support the double-anchoring theory of lightness.
Grouping is a critical mechanism that gates the impact of remote luminances on perceived lightness.
The relevance of distant luminances is context-dependent, modulated by grouping.