- American Synesthesia Association (ASA)
 - Working to educate people about the sensory phenomenon. - BBC Radio 4: Hearing Colours, Eating Sounds
- Audio archive of a two-part examination of synesthesia, in which people experience an intermingling of their senses.
- Blue Cats and Chartreuse Kittens: How Synesthetes Color Their World
- By Patricia Lynne Duffy. A synesthete examines the condition in which people perceive the world with a co-mingling of the senses.
- Mixed Signals - Synesthesia Online
- Information about the neurological condition as well as a message board, calendar, and resources.
- NPR: For Pianist, Music Unleashes Rainbows of Color
- April 2005 profile of pianist Laura Rosser, whose synesthesia causes her to perceive the music that she hears in colour.
- Science Channel: When Senses Collide
- Online companion to When Senses Collide, the TV special about synesthesia, the condition that causes people to experience a mixing of the senses.
- sensequence
- Examines the phenomenon as it manifests itself in people who have forms of time unit synesthesia.
- Synaesthesia Index
- Features information and personal experiences.
- Synesthesia - The Mixing of the Senses
- Analyzes thought processes and the possible ramifications of hybridization on perception.
- Synesthesia and the Synesthetic Experience
- Synesthesia Battery, The
- Test available to the whole community of researchers and synesthetes for their use in making scientific progress.
- Synesthesia: Phenomenology and Neuropsychology
- Richard E. Cytowic's 1995 article providing a history and clinical overview of the condition.
- UK Synesthesia Association
- Run by and for people with an interest in synaesthesia.
- Wikipedia: Synaesthesia
- Hyperlinked article about those who experience correspondences between the shades of colour, tones of sounds, and intensities of tastes that provoke alternate sensations.
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