There are several more notable forms of synesthesia, along with grapheme-color and number-form synesthesia: A final hypothesis about the causes of synesthesia is one that is based on ideasthesia: synesthesia is a phenomenon caused by the extraction of meaning from a stimulus. This has to do with a reduction in the amount of inhibition along an already existing feedback pathway, which means that the signals that are feeding back from the later stages of sensory processing can influence the earlier stages, causing an association between the two different stimuli. An alternative cause for synesthesia is known as diminished feedback. For example, when an individual associates color with graphemes, it would most likely be due to the fact that there is cross-activation in the region associated with grapheme-recognition and the color area (known as V4). When these sections interact, or cross-talk, it can account for the many different types of synesthesia. However, because of difficulties in measuring subjective experiences and the rising popularity of behaviorism (making the study of any subjective experience a sort of taboo), the study of synesthesia faded into scientific oblivion somewhere between 19.Ĭertain regions of the brain are dedicated to specific functions. The first empirical survey of colored photisms was conducted by Gustav Fechner in 1876, and Carl Jung referred to “color hearing” in his Symbols of Transformation in 1912. ![]() Medical descriptions, however, did not arise until 1812, in a thesis written by the German physician Sachs. These were the first instances of interest in “colored hearing”. Greek philosophers once asked if the color of music was a quantifiable quantity, a question that was later asked again by Isaac Newton, when he proposed that musical and color tones share a common frequency. These dates can appear as a three-dimensional map, or dates can be described as physically farther away or closer to the synesthete. Another form is number form synesthesia: numbers, dates, months of the year, or days of the week can elicit precise locations in space. For example, 8 is always blue, while 9 is green. Synesthesia is defined as “the production of a sense impression relating to one sense or part of the body by stimulation of another sense or part of the body.” The most commonly reported form is grapheme, or color synesthesia: letters and numbers are always associated with an inherent color. There is a sort of union of senses in their mind, one that links senses that would otherwise be unrelated. ![]() Can you imagine being able to hear something that you taste, or taste a sound? People with synesthesia experience things like this everyday.
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