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Synesthesia

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...

Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

Neuroplasticity

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

Higher Mental Functions of Brain: Learning and Memory

Higher Mental Functions of Brain: Learning and Memory

Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or playing an...

Introduction to Special Senses

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.

Tactile and Chemical Senses

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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Related Experiment Video

Updated: Jun 23, 2026

Training Synesthetic Letter-color Associations by Reading in Color

Training Synesthetic Letter-color Associations by Reading in Color

Published on: February 20, 2014

Synaesthesia: learned or lost?

Roi Cohen Kadosh¹, Avishai Henik, Vincent Walsh

¹Institute of Cognitive Neuroscience & Department of Psychology, University College London, UK. r.cohenkadosh@ucl.ac.uk

Developmental Science

|April 18, 2009

Summary

This summary is machine-generated.

Synaesthesia, an atypical brain connection, may be both innate and learned. This study integrates congenital and learning explanations, suggesting interactive specialization in brain development underlies synaesthetic experiences.

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Visual Classical Conditioning in Wood Ants

Visual Classical Conditioning in Wood Ants

Published on: October 5, 2018

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Last Updated: Jun 23, 2026

Training Synesthetic Letter-color Associations by Reading in Color

Training Synesthetic Letter-color Associations by Reading in Color

Published on: February 20, 2014

Visual Classical Conditioning in Wood Ants

Visual Classical Conditioning in Wood Ants

Published on: October 5, 2018

Area of Science:

Neuroscience
Developmental Psychology
Cognitive Science

Background:

Synaesthesia involves atypical sensory binding, with two main explanations: congenital (innate) and learning-based.
Recent studies offer conflicting evidence, with some supporting a learned basis and others an innate one.
Understanding the origins of synaesthesia is crucial for explaining its neural mechanisms.

Purpose of the Study:

To reconcile the congenital and learning explanations of synaesthesia.
To propose an integrated developmental account for synaesthesia.
To elucidate the underlying neuronal mechanisms of synaesthesia.

Main Methods:

Reassessment of existing evidence on synaesthesia.
Integration of congenital and learning perspectives.
Development of an interactive specialization model.

Main Results:

Evidence suggests that synaesthesia can be both innate and learned.
Everyday language frequency implicitly influences synaesthetic experiences.
Synaesthesia may reflect innate magnitude representations.

Conclusions:

Both congenital and learning factors likely contribute to synaesthesia.
An interactive specialization model explains synaesthesia development.
This integrated approach offers a more comprehensive understanding of synaesthesia's neuronal basis.