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Related Concept Videos

Synesthesia01:27

Synesthesia

Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
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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.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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...

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Related Experiment Video

Updated: Jun 25, 2026

Training Synesthetic Letter-color Associations by Reading in Color
10:27

Training Synesthetic Letter-color Associations by Reading in Color

Published on: February 20, 2014

Implicit versus explicit interference effects in a number-color synesthete.

Ilaria Berteletti1, Edward M Hubbard, Marco Zorzi

  • 1Center for Cognitive Science, University of Padoa, Italy.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 10, 2009
PubMed
Summary
This summary is machine-generated.

Synesthesia involves subjective color experiences with digits. Even without subjective color for dot patterns, objective measures showed interference, revealing a dissociation between conscious experience and cognitive processing in synesthesia research.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology of Consciousness

Background:

  • Investigating the link between subjective reports and objective measures in consciousness studies.
  • Examining grapheme-color synesthesia, where individuals perceive colors associated with digits.

Observation:

  • A synesthete (NM) reported colors for digits but not for random dot patterns.
  • Two Stroop tasks (Digit Stroop and Numerosity Stroop) were employed to assess objective correlates.

Findings:

  • Longer response times were observed in incongruent conditions for both tasks.
  • This occurred even when NM denied subjective color experiences for dot patterns, showing a dissociation.

Implications:

  • Suggests distinguishing true synesthesia from pseudosynesthesia relies on subjective reports validated by objective measures.
  • Highlights potential differences in mechanisms underlying conscious and unconscious cognitive interference.