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Related Concept Videos

Subliminal Perception01:15

Subliminal Perception

Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
Factors Affecting Perception01:25

Factors Affecting Perception

Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
Hindsight Biases01:12

Hindsight Biases

Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Sensation01:21

Sensation

Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
Absolute thresholds can quantify the sensitivity of sensory...
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Related Experiment Video

Updated: Jul 15, 2026

A Method for Investigating Change Blindness in Pigeons (Columba Livia)
06:14

A Method for Investigating Change Blindness in Pigeons (Columba Livia)

Published on: September 7, 2018

Undetected changes in visible stimuli influence subsequent decisions.

Cédric Laloyaux1, Christel Devue, Stéphane Doyen

  • 1Cognitive Science Research Unit, Université Libre de Bruxelles CP 191, Av. F.-D. Roosevelt, 50, 1050 Bruxelles, Belgium. claloyau@ulb.ac.be

Consciousness and Cognition
|April 21, 2007
PubMed
Summary

Even undetected gradual changes in facial expressions influence recognition decisions and lower confidence. This suggests unnoticed emotional stimuli can still impact behavior.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Change blindness is the failure to detect visual changes.
  • Gradual changes, especially in facial expressions, are particularly difficult to detect.

Purpose of the Study:

  • To investigate if undetected gradual changes in facial expressions influence subsequent decisions.
  • To examine the effect of undetected changes on decision confidence.

Main Methods:

  • Participants viewed static and gradually changing facial expressions.
  • Recognition decisions and confidence ratings were collected.

Main Results:

  • Participants were influenced by undetected gradual changes in facial expressions.
  • Confidence was lower for changing displays compared to static ones.

Conclusions:

  • Undetected changes in salient stimuli, like facial expressions, can causally affect behavior.
  • This supports the idea that unconscious processing influences decisions and confidence.