Types of perceptual distortions

Perceptual distortions are phenomena that alter our ability to perceive the environment in a realistic way. Do you want to know what types of distortions exist and how they can be classified? Do not miss it!

Surely you have ever heard this phrase: The mind deceives us! Or perhaps it is our senses that do it? In this article we will know what perceptual distortions are, also called sensory distortions. These are perceptual anomalies in which a real stimulus from outside is perceived differently than expected given its formal characteristics.

There are different types of perceptual distortions that can be classified according to a series of parameters, such as: intensity, quality, size, shape ...

We must not confuse perceptual distortions with hallucinations . In hallucinations (perceptual delusions), the perceptual experience is not based on really existing stimuli, unlike perceptual distortions, where a real stimulus does exist.

These two phenomena make up the so-called psychopathology of perception, an area of ​​psychopathology that has always aroused great interest among researchers. Do you want to know what are the types of perceptual distortions and how do they work? Here we will unravel the mysteries of this curious and complex sensory-perceptual phenomenon .

"Each act of perception is to some extent an act of creation, and each act of memory is to some extent an act of imagination"

-Oliver Sacks-

According to the Belloch, Sandín and Ramos (2008) manual, the different types of perceptual or sensory distortions can be classified according to five parameters:

  • Intensity
  • Quality
  • Size and shape
  • Perceptual integration
  • Delusions

Let's see what denomination each of the distortions receive according to their typology, what characteristics they present and what are some of their examples.

According to its intensity

They are those perceptual phenomena that imply an anomaly in the intensity with which we usually perceive the environment (for example, sounds). In this case, the quality of the stimulus is maintained, but to a different degree. In this group we find three types of perceptual distortions:


Hyperesthesia can be defined as a perceptual condition that involves increased sensitivity to stimuli. That is, there is an excess of sensitivity. Hyperesthesia generally affects the sense of touch, but also the other senses such as hearing.

On the other hand, hyperesthesia can also lead to an increase in pain perception . Examples of hyperesthesia would be: perceiving the ticking of the clock too high or noticing the taste of sugar as excessively sweet.


In contrast, hypoesthesias are perceptual distortions in which there is a decrease in sensitivity to stimuli.


In the case of anesthesia, there is an absence of perception of the environment; that is, it is the absolute absence of perception of the intensity of the stimuli . In the specific case of the absence of pain perception, we speak of a variant: analgesia .

According to its quality

According to the quality of the perceptual distortions we find those that affect, as its name suggests, the quality of the stimuli. That is to say, they imply a change to another quality ; for example, perceiving sugar as salty, seeing it all black or that the flowers smell of excrement.

They are usually associated with distortions in intensity. On the other hand, we should not confuse this type of distortion with gustatory or olfactory hallucinations.

According to its size and shape

They are the so-called metamorphopsias . In turn, these are divided into: dysmegalopsias (according to their size) and dysmorphopsias (according to their shape). Let's see what distortions are included in each group:

Dysmegalopsias (size)

If we perceive an object as larger than it really is, then we have a macropsy or megalopsia . These phenomena also occur when we perceive an object or stimulus closer to us than it really is. An example of this would be "seeing an ant the size of a dog."

On the other hand, if we perceive the smallest or furthest object from reality, we speak of micropsies. Finally, the autometamorfopsias are the distortions referred to the own body , in form and size (for example perceiving ourselves taller and elongated).

Dysmorphopsias (form)

Dysmorphopsias have to do with form; They are classified into:

  • Plagiopsy : involves seeing oblong and elongated objects, as well as larger than they really are.
  • Displatiopsy : consists of seeing the objects with the greatest width.
  • Kinetopsia - This is about seeing with larger, moving objects (when they don't actually move).

An example of dysmorphopsia can be seen illustrated in Dalí's Soft Clocks.

According to perceptual integration

This quality refers to the union or separation of the stimulus. Thus, when the stimulus is perceived as fragmented or separate, we speak of a perceptual split. On the other hand, when we perceive it merged with another, we speak of an agglutination.

Perceptual excision

In perceptual divisions we perceive that objects are separated from each other, when in fact they remain united. If the separation occurs in the form of the object, then we speak of morpholysis; on the other hand, if it occurs between a color and a shape (perceiving that the color separates from the object, for example), we speak of metachromia.

An example of perceptual cleavage would be to see the hands of the clock separated from the numbers.


Perceptual distortions involving clumping are called synesthesia . Someone with synesthesia involuntarily experiences the activation of an additional sensory or cognitive pathway in response to specific stimuli. An example would be perceiving colors when listening to music.

Other perceptual distortions: illusions

Optical illusions are also perceptual distortions. In this case, these are anomalies in the structuring of ambiguous stimuli; in other words, it is an illusion is the wrong perception of a specific object .

There are two kinds of illusions: pareidolias (when a vague and random stimulus, for example an image, is mistakenly perceived as a recognizable form) and the sense of presence (feeling that someone is physically close to us, when in reality we are not it is).

Examples of illusions would be: the faces we see drawn on a bonfire or having the feeling of not being alone when we really are.

"Perception is real even when it is not reality."

-Edward De Bono-

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