Neuroscience
A training regime at the University of Sussex has successfully conditioned fourteen people with no prior experience of synesthesia - crossing of the senses - to experience coloured phenomena when seeing letters.
The regime took place over nine weeks, a half hour session every workday together with extra homework. Again and again, the trainees were encouraged to treat the letter "r" as red, or "e" as green, with a similar process repeated on 13 letters in all. This was tested every session using tasks such as viewing a sequence of letters and selecting all the associated colours, or completing a timed reading task where letters were omitted and replaced with squares of the relevant colours, for example: "Mann■■ M■ss■■n t■ Ma■s."
Tasks became progressively harder and the group were financially incentivised to outperform their previous scores. No previous intervention has been as extensive as this one, as Daniel Bor and colleagues were seeking to go beyond learned colour-letter associations to try and produce a genuine subjective experience of synesthesia.
After the training, the group became better at those "Stroop" test trials where the entrained colour of a presented letter matched the ink colour it was written in, and the task was to name the ink colour as fast as possible. This suggests that the training had gone deep enough to help them make rapid, non-reflective decisions.
The majority of participants also reported gaining a subjective experience of synesthesia. By their own accounts, nine definitely experienced a coloured effect when seeing trained letters, which was mostly characterised as seeing the colour "in front of my mind's eye" (only two participants definitely didn’t have this experience). Naturally occurring synesthetic effects can be stronger than this, with colours seen floating on the surface of the letter or number, but the reported experiences are nonetheless impressive.
In addition, participants got smarter, scoring an equivalent of 12 IQ points higher on a standard intelligence test administered pre- and post-training. We should make no firm conclusions from this, as the causal mechanism may be other aspects of the training process not directly related to synesthesia, such as the heavy load on working memory. Even so, achieving a 12-point increase in a normal- to high-functioning group is not something routinely delivered by psychology interventions.
Three months later, did the synesthesia stick? Not so much. The effect on the Stroop task was maintained, suggesting learned associations were going strong, but participants reported a weakening or total dissipation of the coloured experience itself, which is the defining feature of synesthesia proper.
Nevertheless, this work questions whether synesthesia is limited to a rare and genetically distinct group, and shows how learning and experience likely plays an important part too. We already know that young synesthetes experience a strengthening of their colour linkings during early school years. Perhaps early pairings - seen on coloured alphabet jigsaws or fridge magnets - provide the initial associations that some people develop into an ever-present feature of their world.
_________________________________
Bor, D., Rothen, N., Schwartzman, D., Clayton, S., & Seth, A. (2014). Adults Can Be Trained to Acquire Synesthetic Experiences Scientific Reports, 4 DOI: 10.1038/srep07089
Post written by Alex Fradera (@alexfradera) for the BPS Research Digest.
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Neuroscience
After this training regime, people saw letters of the alphabet as being alive with colour
The regime took place over nine weeks, a half hour session every workday together with extra homework. Again and again, the trainees were encouraged to treat the letter "r" as red, or "e" as green, with a similar process repeated on 13 letters in all. This was tested every session using tasks such as viewing a sequence of letters and selecting all the associated colours, or completing a timed reading task where letters were omitted and replaced with squares of the relevant colours, for example: "Mann■■ M■ss■■n t■ Ma■s."
Tasks became progressively harder and the group were financially incentivised to outperform their previous scores. No previous intervention has been as extensive as this one, as Daniel Bor and colleagues were seeking to go beyond learned colour-letter associations to try and produce a genuine subjective experience of synesthesia.
After the training, the group became better at those "Stroop" test trials where the entrained colour of a presented letter matched the ink colour it was written in, and the task was to name the ink colour as fast as possible. This suggests that the training had gone deep enough to help them make rapid, non-reflective decisions.
The majority of participants also reported gaining a subjective experience of synesthesia. By their own accounts, nine definitely experienced a coloured effect when seeing trained letters, which was mostly characterised as seeing the colour "in front of my mind's eye" (only two participants definitely didn’t have this experience). Naturally occurring synesthetic effects can be stronger than this, with colours seen floating on the surface of the letter or number, but the reported experiences are nonetheless impressive.
In addition, participants got smarter, scoring an equivalent of 12 IQ points higher on a standard intelligence test administered pre- and post-training. We should make no firm conclusions from this, as the causal mechanism may be other aspects of the training process not directly related to synesthesia, such as the heavy load on working memory. Even so, achieving a 12-point increase in a normal- to high-functioning group is not something routinely delivered by psychology interventions.
Three months later, did the synesthesia stick? Not so much. The effect on the Stroop task was maintained, suggesting learned associations were going strong, but participants reported a weakening or total dissipation of the coloured experience itself, which is the defining feature of synesthesia proper.
Nevertheless, this work questions whether synesthesia is limited to a rare and genetically distinct group, and shows how learning and experience likely plays an important part too. We already know that young synesthetes experience a strengthening of their colour linkings during early school years. Perhaps early pairings - seen on coloured alphabet jigsaws or fridge magnets - provide the initial associations that some people develop into an ever-present feature of their world.
_________________________________
Bor, D., Rothen, N., Schwartzman, D., Clayton, S., & Seth, A. (2014). Adults Can Be Trained to Acquire Synesthetic Experiences Scientific Reports, 4 DOI: 10.1038/srep07089
Post written by Alex Fradera (@alexfradera) for the BPS Research Digest.
- What Colour Is Your Breast-stroke? Or Why Synaesthesia Is More About Ideas Than Crossed-senses
People with synaesthesia experience odd sensations that make it seem as though their neural wires are crossed. A certain word might always come served with the same particular taste, or a letter or numeral might reliably evoke the same particular colour....
- How Common Is Synaesthesia Among Children?
For the first time, psychologists have documented the prevalence of a form of synaesthesia - the condition that leads to a mixing of the senses - in a large sample of children. Over a twelve month period, Julia Simner and colleagues tested 615 children...
- Tony Blair Tastes Like Desiccated Coconut...
...and 'George Bush is like crusty potato' James Wannerton, president of the UK Synaesthesia Association, explains how the condition which "mixes the senses" affects his life. He is speaking at a conference in Edinburgh where scientists and...
- Synesthetes Show Greater Connectivity In The Inferior Temporal Cortex
Ah ah Something ain't right I'm gonna get myself I'm gonna get myself I'm gonna get myself connected --Stereo MC's, Connected SYNESTHESIA can be defined as ...an unusual conscious experience, in which stimulation of one sensory modality...
- More About Synesthesia
I was so excited about my possible synesthetic experience last week (aural synesthesia?) that I didn't explain what synesthesia actually is. It just so happened that on last week's episode of Australia's terrific radio program All in the Mind,...