December 17, 2009
Color My Numbers
For as many as 1 in 20 people, everyday experiences can elicit extra-ordinary associated sensations. The condition is known as synaesthesia and the most common form involves "seeing" colors when reading words and numbers. Many previous studies have shown that the brains of people who experience this phenomenon are different from those who do not and, in a new study reported in the February 2010 issue of Cortex (http://www.elsevier.com/locate/cortex), published by Elsevier, researchers from the University of Padova, Italy, have discovered that learning may also play an important role in synaesthesia and can lead to synaesthetic behavior even when the person is not consciously aware of the experience.
Dr Ilaria Berteletti and colleagues tested an Italian synaesthete using a classic test, in which the participant was shown a series of numbers presented in different ink colors and asked to name those colors. A synaesthete for whom the number 2 is red will find it more difficult to name the ink color of a green 2 than if the number is presented in red ink and will take longer to respond. This slowing of response is generally taken as evidence that synaesthetic experiences are real and automatic.
According to co-author Dr Edward Hubbard, "a lifetime of synaesthetic experiences may lead to the creation of learned associations between different classes of stimuli" and that "conscious awareness of these associations is not necessary for them to affect behavior".
On the Net: