The Synesthesia Battery

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What is Synesthesia?

Synesthesia is a perceptual condition of mixed sensations: a stimulus in one sensory modality (e.g., hearing) involuntarily elicits a sensation/experience in another modality (e.g. vision). Likewise, perception of a form (e.g., a letter) may induce an unusual perception in the same modality (e.g. a color). Click here for more information on synesthesia.

What is the Synesthesia Battery?

This battery of tests provides a standard battery of questions, tests and scoring. This test is available to the whole community of researchers and synesthetes for their use in making scientific progress. Your data will be kept entirely private, for use only by yourself, and by a researcher if you provide a valid email address for one.

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Preview The Battery

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Are you a Synesthete?

Not sure if you're a synesthete? Click here to answer a few preview questions to find out! If you think you are a synesthete, please register here to begin with the questionnaire. Upon completion of the questionnaire, you will be automatically routed to the online software tests appropriate for the forms of synesthesia you experience.

If you have previously taken any of the tests or wish to continue with an unfinished set, please login to complete the battery and then view your results.

Are you a Synesthesia Researcher?

If you are a researcher, you may direct your synesthetic subjects to this site and ask them to include your email address when they register. Use of this battery, with its standardized scoring system, will allow data combination or comparison among laboratories. If you have been invited by, on behalf of a synesthete, to view his/her results, please enter the username and password that has been emailed to you and login here.

Additionally, if you are a researcher using MATLAB, I am making available the Texsyn Toolbox, a collection of MATLAB programs developed in Dr. David Eagleman's laboratory for testing various aspects of synesthetic experience. Please click here for information and downloading.

If you are publishing results derived from the online Synesthesia Battery or the Texsyn Toolbox, please cite: David M. Eagleman, Arielle D. Kagan, Stephanie S. Nelson, Deepak Sagaram, Anand K. Sarma. A standardized test battery for the study of Synesthesia. Journal of Neuroscience Methods, 2007 Jan 15;159(1):139-145. [Click here for pdf] Please report any bugs in the online software or the MATLAB software to

The Book

To learn more about synesthesia, check out our book - Wednesday Is Indigo Blue: Discovering the Brain of Synesthesia