What is Synesthesia?

What is Synesthesia?

Feb 10, 2024

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What is synesthesia?

Synesthesia is a phenomenon that causes sensory crossovers, such as tasting colors or feeling sounds. Some people describe it as having “wires crossed” in their brain because it activates two or more senses when there’s only a reason for one sense to activate.

Synesthesia isn’t a disease or a medical condition, but it can be a symptom of certain brain-related conditions.

How does synesthesia work?

To understand synesthesia (pronounced “sin-ess-THEE-zh-uh”), it helps to understand how your senses work. Your brain relies on your five main senses — sight, sound, smell, taste or touch — to know what’s happening around you.

That involves the following steps:

  1. Detection: Your senses pick up something happening around you. An example would be using your eyes to look at your surroundings or using your ears to listen for certain sounds.

  2. Signaling: Your senses send a signal to your brain describing what they’re experiencing. For example, your eyes would describe the colors and shapes of the things you can see nearby, or your ears would send signals that describe how loud a sound is, if it’s high- or low-pitched, etc.

  3. Processing: Your brain receives those signals and routes them to a certain area for processing. The area that does the processing connects to areas that help you understand what you’re seeing. Examples of this are recognizing a stop sign by its shape and/or color or recognizing that a sound is a piece of music or someone’s voice.

In short, your senses describe to your brain what they pick up, and your brain creates its own understanding of the world around you from those descriptions. But people with synesthesia experience the processing step differently. Their brains process the same information through two or more brain areas at once. That causes a primary and at least one secondary effect:

  • Primary effect: The primary effect is what you experience because of sensory input. An example of this would be hearing sounds and recognizing them as music.

  • Secondary effect: People with synesthesia experience a secondary effect (or more than one) that seems like it’s one of their senses working, but there’s no input from that sense that should be causing it. An example of this would be seeing colors because you hear music.

Visual synesthesia can also happen in different ways. Some people experience visual synesthesia like a “projection,” meaning their brain directly combines the secondary effect into their sense of sight. That causes them to experience it as if they actually see it. Other people have an “internal screen” effect. They can automatically picture it in their head but don’t experience it as if they were seeing it directly.

How many different forms of synesthesia are there?

While you have five main senses, there are many different things you can identify with each sense. These are perception abilities. Some examples include:

  • Sight: Colors, patterns, textures, shapes.

  • Hearing: Volume, pitch, frequency.

  • Touch: Temperatures, pressure, textures, vibrations, pain.

Some perception abilities involve more than one sense, like balance. Your perception abilities can also involve concepts you understand using your senses, such as time, numbers and language.

Because there are so many possible combinations between your senses and perception abilities, researchers can identify at least 60 different forms of synesthesia. Some experts estimate there are more than 150 different forms. This is also why many people with synesthesia have it but don’t know what it is or that it’s unusual.

Some forms of synesthesia are better known or are more common. These include:

  • Auditory-tactile synesthesia.

  • Day-color synesthesia.

  • Grapheme-color synesthesia.

  • Hearing-motion synesthesia.

  • Mirror-touch synesthesia.

  • Time-space synesthesia.

  • Visualized sensations.

Auditory-tactile synesthesia

This form of synesthesia means that sounds cause you to feel touch-based sensations, such as temperature changes, pressure or pain.

Day-color synesthesia

Some people see or associate certain colors with days of the week. This is one of the more common forms of synesthesia.

Grapheme-color synesthesia

“Grapheme” is the word for the smallest part of a written language, like a letter, number or symbol. Some people see different graphemes with specific colors. People who experience visual synesthesia’s projection effect often see graphemes as different colors.

Hearing-motion synesthesia

Some people experience sounds related to seeing things moving. An example of this would be a person hearing a “whoosh” sound when watching something go past them.

Mirror-touch synesthesia

Mirror-touch synesthesia is when you see something happen to someone else and physically feel it, too. It works similarly to the reflexive cringe you might have if you see someone trip and face-plant in front of you. However, the effect is much stronger.

Some people can watch another person being touched on the arm or hand and they also feel it. Other people can actually feel pain that others describe or pain from visible injuries. This form is more likely to be disruptive if it causes you to feel pain as a secondary effect.

Sound-color synesthesia

Sound-color synesthesia is where you see specific colors when you hear certain sounds. It tends to be specific to certain sounds or music. Musicians and artists often describe having this form.

Time-space synesthesia

This is a form of synesthesia where you visualize things in a very specific way. People who have this form of synesthesia often “see” sequences with specific patterns or forms. An example of this is visualizing a calendar or a string of numbers in a certain way. Some people can mentally “map” these out in vivid or detailed ways.

Can synesthesia have different levels of intensity?

Yes, synesthesia can affect people differently. Some people may only experience synesthesia under certain circumstances. Others may experience synesthesia for many reasons, or they might experience more than one secondary effect.

In severe cases, synesthesia can be strong enough to affect your ability to concentrate or focus. Fortunately, this is rare. Synesthesia is usually short-lived, so it’s usually not disruptive to this degree. People who do have it to this extent can usually learn to manage these secondary effects.

Possible Causes

What are the most common causes of synesthesia?

Experts don’t fully understand why synesthesia happens. But they do know there are three main types of it:

  • Developmental (sometimes called “genuine” or “constitutional”).

  • Acquired.

  • Drug-induced.

Developmental synesthesia

People who have developmental synesthesia are “neurodivergent.” That means their brain developed and works in a way that’s different from “neurotypical” people, whose brains developed and work as expected.

Experts can’t yet fully explain why this happens, but they suspect it may involve multiple factors:

  • Brain development: There’s some evidence that everyone has synesthesia very early in life and that it’s part of the brain’s natural development. If that’s the case, that means it fades for most people, which is why only a small percentage of adults have it.

  • Brain structure: People with synesthesia seem to have more connections between different brain areas. That might explain why multiple brain areas activate from one type of sensory input. It also might be a factor in why the rate of synesthesia in people with autism spectrum disorder (ASD) is at least triple the rate in people without ASD.

  • Genetics: Synesthesia seems to run in families. However, the form of synesthesia can vary from person to person, which indicates that this isn’t something that people learn from family members.

Acquired synesthesia

Some people can “acquire” synesthesia because of damage to their brain. Experts suspect this type of synesthesia happens because connections within your brain can change and evolve as your brain recovers from an injury.

But some subtle differences set this type of synesthesia apart:

  • It’s less consistent. People with acquired synesthesia may not experience it as often as people who’ve had it all their life. Some people may only experience it under very specific circumstances, or it might go away over time.

  • Certain primary effects can’t cause it. Unlike developmental synesthesia, music doesn’t cause synesthesia if someone has the acquired type.

  • Secondary effects are simple and short-lived. Developmental synesthesia effects can be longer-lasting, and they can shift and change to follow along with whatever causes them. Acquired synesthesia effects are brief, simple and don’t follow or shift with changes in what causes them.

Drug-induced synesthesia

Nonmedical use of certain drugs, especially hallucinogens (drugs that cause pseudohallucinations and, very rarely, hallucinations), can sometimes cause synesthesia. This is especially the case at higher doses. These drugs, also known as “psychedelics,” include:

  • Dimethyltryptamine (also known as “DMT”).

  • LSD (also known as “acid”).

  • Peyote (including mescaline, a substance derived from peyote).

  • Psilocybin (sometimes known as “magic mushrooms,” “psychedelic mushrooms” or just “shrooms”).

Like acquired synesthesia, there are some differences in how drug-induced synesthesia typically affects people. These include:

  • They’re emotion dependent. Your emotional state affects if and how you experience synesthesia.

  • It can alter what you perceive. Developmental and acquired synesthesia may affect how you experience something, but they don’t change what you experience. Drug-induced synesthesia can cause hallucinations, which can change what you experience.

  • It’s not automatic. You can sometimes minimize or stop drug-induced synesthesia by focusing on specific things or changing certain things in your environment (such as lighting).

Care and Treatment

How is synesthesia treated?

Developmental and acquired synesthesia don’t need treatment. In rare cases, some people may experience effects they don’t like, but they can learn to manage or minimize these effects.

Drug-induced synesthesia may happen at higher doses. That might indicate that a person needs treatment for an overdose of those drugs. However, the treatment can vary depending on the drug in question. Generally, the treatments for these are supportive, helping minimize other more serious symptoms such as seizures or agitation.

Can synesthesia be prevented?

The developmental and acquired types of synesthesia aren’t preventable. The only preventable form is drug-induced synesthesia. Drugs that can cause it are illegal in many places, but there are exceptions for religious or traditional uses. Limiting your exposure to or intake of these drugs in those situations can make it less likely that you’ll experience drug-induced synesthesia.

Esp

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Me gustaría invitarte a mi viaje, en el que podrás explorar las joyas ocultas y las maravillas de la vida a través de los ojos de un sinestésico. Aquí explicaré cómo se sienten el sexo y el dolor para una persona con hipersensión...

¿Qué es la sinestesia?

La sinestesia es un fenómeno que provoca cruces sensoriales, como saborear colores o sentir sonidos. Algunas personas la describen como tener «cables cruzados» en el cerebro porque activa dos o más sentidos cuando solo hay una razón para que se active uno.

La sinestesia no es una enfermedad ni una afección médica, pero puede ser un síntoma de ciertas afecciones relacionadas con el cerebro.

¿Cómo funciona la sinestesia?

Para entender la sinestesia (que se pronuncia «Sin-ess-thee-zh-uh»), es útil entender cómo funcionan los sentidos. El cerebro depende de los cinco sentidos principales (vista, oído, olfato, gusto o tacto) para saber lo que sucede a su alrededor.

Esto implica los siguientes pasos:

Detección: tus sentidos captan algo que sucede a tu alrededor. Un ejemplo sería usar los ojos para observar lo que te rodea o usar los oídos para escuchar ciertos sonidos.

Señalización: los sentidos envían una señal al cerebro para describir lo que están experimentando. Por ejemplo, tus ojos describirían los colores y las formas de las cosas que puedes ver cerca, o tus oídos enviarían señales que describen qué tan fuerte es un sonido, si es agudo o grave, etc.

Procesamiento: el cerebro recibe esas señales y las dirige a una zona determinada para su procesamiento. El área que procesa se conecta con las áreas que te ayudan a entender lo que estás viendo. Algunos ejemplos de esto son reconocer una señal de stop por su forma o color o reconocer que un sonido es una pieza musical o la voz de alguien.

En resumen, los sentidos describen al cerebro lo que captan, y el cerebro crea su propia comprensión del mundo que lo rodea a partir de esas descripciones. Sin embargo, las personas con sinestesia experimentan el proceso de procesamiento de manera diferente. Sus cerebros procesan la misma información a través de dos o más áreas cerebrales a la vez. Esto provoca un efecto primario y al menos uno secundario:

Efecto principal: el efecto principal es lo que experimentas debido a la información sensorial. Un ejemplo de esto sería escuchar sonidos y reconocerlos como música.

Efecto secundario: las personas con sinestesia experimentan un efecto secundario (o más de uno) que parece deberse al funcionamiento de uno de sus sentidos, pero no hay ninguna señal de ese sentido que deba estar causándolo. Un ejemplo de esto sería ver colores cuando oyes música.

LSD (también conocido como «ácido»).

Peyote (incluida la mescalina, una sustancia derivada del peyote).

Psilocibina (a veces conocida como «hongos mágicos», «hongos psicodélicos» o simplemente «hongos»).

Al igual que la sinestesia adquirida, existen algunas diferencias en la forma en que la sinestesia inducida por fármacos suele afectar a las personas. Estas incluyen:

Dependen de las emociones. Tu estado emocional afecta si experimentas la sinestesia y cómo lo haces.

Puede alterar lo que percibes. La sinestesia adquirida y del desarrollo puede afectar la forma en que experimentas algo, pero no cambian lo que experimentas. La sinestesia inducida por fármacos puede provocar alucinaciones, que pueden cambiar lo que experimentas.

No es automático. A veces, puedes minimizar o detener la sinestesia inducida por los medicamentos concentrándote en cosas específicas o cambiando ciertas cosas del entorno (como la iluminación).

Cuidados y tratamiento

¿Cómo se trata la sinestesia?

La sinestesia adquirida y del desarrollo no necesita tratamiento. En raras ocasiones, algunas personas pueden experimentar efectos que no les gustan, pero pueden aprender a controlarlos o minimizarlos.

La sinestesia inducida por fármacos puede ocurrir con dosis más altas. Esto podría indicar que una persona necesita tratamiento por una sobredosis de esos fármacos. Sin embargo, el tratamiento puede variar según el medicamento en cuestión. Por lo general, los tratamientos son de apoyo y ayudan a minimizar otros síntomas más graves, como las convulsiones o la agitación.

¿Se puede prevenir la sinestesia?

Los tipos de sinestesia adquirida y del desarrollo no se pueden prevenir. La única forma prevenible es la sinestesia inducida por fármacos. Las drogas que pueden causarla son ilegales en muchos lugares, pero hay excepciones para usos religiosos o tradicionales. Limitar la exposición o el consumo de estas drogas en esas situaciones puede reducir las probabilidades de que sufras sinestesia inducida por las drogas.

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