Synesthesia is when your senses overlap: you might taste words, hear colors, or see numbers as colored. It usually starts in childhood but can appear later through meditation, sensory deprivation, or brain injury. The Synesthesia Battery is a test that measures whether you have it.
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What is synesthesia? It's a phenomenon that causes sensory crossovers in our brain. This can look like tasting the words you are saying or hearing, or linking colors to numbers and letters that you are thinking about or that you might be listening to. Some people describe it as having their wires crossed in your brain because it activates 2 or maybe more senses when only one sense is usually activated. This phenomenon usually develops when someone is a child. However, in rare cases, synesthesia can also develop later in life, either temporarily from meditation, sensory deprivation, maybe even permanently from head injuries, a stroke, brain tumor. You can take a test like the Synesthesia Battery that will help you get an idea whether you have it.