What is synesthesia?

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Synesthesia is a condition where the stimulation of one sensory modality causes a simultaneous stimulation of another, unrelated sensation.

An example is a particular auditory stimulus that causes a person to experience gustatory (taste) stimulation. Synesthesia is a natural phenomenon and is not associated with the multiple and simultaneous perceptions experienced upon the consumption of drugs or recreational substances.

There are various types or combinations of sensational unrelated or unstimulated experiences that occur in 1 of 23 people. In rarer sensational combinations or three or more simultaneous sensations occurring at the same time, the ratio increases to 1 in 200 or 1 in 100,000 people.

 

Neurocognitive factors related to synesthesia

The development of synesthesia between individuals is associated with a variety of neurocognitive factors, including awareness, activation of sensory nodes in the brain, and automatic cognitive processes.

The most common neurocognitive explanation used by researchers to explain synesthesia is “cross-wiring” in the brain. In particular, the synapses and neurons of one particular sensory system overlap with the other brain system.

 

The hypothesis that supports this claim postulates that such a phenomenon normally occurs at birth and childhood but is refined as the child grows. Therefore, people with synesthesia have underdeveloped sensory systems.

 

When researchers have yet to discover exact areas of the brain where synesthesia becomes, the limbic system and the cerebral cortex are considered as the main candidates.

Brain imaging techniques show the significant responses associated with synesthetic factors and sensory stimuli when testing in these areas. These activations between synesthetic individuals are not present in people with normal neurological functioning.

Over the years, researchers have been interested in establishing a connection between synesthesia and consciousness. According to new results, synesthesia is directly related to consciousness by sharing correlated neural processes.

The experiences of individuals with synesthesia clarify individual differences in conscious perceptions. As such, further understanding about the underlying processes involved in the sensory perceptions of synesthetics will pave the way for a more expensive take on consciousness.

synesthesia

Diagnosing synesthesia

While the condition is associated with psychiatric disorders, synesthesia is not included in the latest diagnostic and statistical manual of mental disorders (DSM-5). Nevertheless, it is referred to as “a neurological condition” that most commonly occurs in women and left-handed people. People with normal neurological functioning could also acquire the condition.

Currently, there is no official way to diagnose synesthesia; however, research shows that the following characteristics are present among synesthetics:

  • There is an inability to control the condition. People with synesthesia experience the condition unintentionally;
  • Synesthetics experience the condition as if it protruded out of their bodies rather than as illusory or imaginary perceptions;
  • The experiences associated with a particular stimulus are consistent, durable, and generic. For a particular experience, the same unrelated sensation would always be associated. For example, hearing Johann Pachelbel’s Canon in D would always make synesthetic strawberries of a taste despite social or environmental differentiations.
    The secondary sensation is usually remembered more than the primary sensation. For example, a person who hears the sound of chiming bells whenever he sees the word sad would associate emotion with the sounds of the bell;
  • Synesthetic perceptions also influence emotional reactions. Individuals may feel elated or pleasured upon “tasting” a particular word or “hearing” a particular taste;
  • Synesthesia is also associated with genetic factors. The researchers propose that the condition runs in families and is transmitted through a dominant x chromosome.

Treating synesthesia

Synesthesia is often treated as a capacity rather than a disability; as such, the majority of people with the condition do not seek treatment. Furthermore, dealing with or entirely resolving synesthetic experiences is not easy, as the condition is directly associated with neural functioning and genetics-factors that are difficult to alter.

Physicians therefore address only one example of synesthesia when the condition begins to affect normal, daily functionality. In such cases, doctors or therapists usually ask patients to engage in deep hypnosis therapy. Hypnotic techniques have been found to be effective in addressing the condition.

In deep hypnosis, patients are asked to participate in a series of activities that would ultimately address and eliminate their conscious (synesthetic experiences) or unconscious (dream) cognitions. If successful, the whole sensory experience can be reduced or resolved.

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