Visual suppressions

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Visual suppressions can be defined as any subjective effect which decreases a person's ability to perceive the external environment through their sense of sight.

This page lists and describes the various visual suppressions which can occur under the influence of certain psychoactive compounds.

Acuity suppression

Main article: Acuity suppression
Blurry London by Josikins - This image serves as an accurate replication of acuity suppression as seen from the golden jubilee footbridge in central London.

Acuity suppression can be described as the experience of a person's sense of vision becoming partially to completely blurred and indistinct. This effect may affect the entirety of the person's vision or specific sections of it. Depending on its intensity, this can often result in a reduced ability to function and perform basic tasks which necessitate the use of sight.

Acuity suppression is often accompanied by other coinciding effects such as double vision and pattern recognition suppression. This effect is most commonly induced under the influence of moderate dosages of depressant and dissociative compounds, such as alcohol, quetiapine, ketamine, and DXM.

Colour suppression

Main article: Colour suppression

Color suppression can be described as the experience of colours becoming darker, more saturated and harder to distinguish from one another. During this experience, reds may seem “less red”, greens may seem “less green”, etc and all colours will likely have become much vaguer and more subtle to look at than they comparatively would be during everyday sober living. At higher levels, this effect can result in the external environment appearing to be black and white, monochrome, and completely devoid of colour.

Colour suppression is often accompanied by other coinciding effects such as acuity suppression and double vision. It is most commonly induced under the influence of heavy dosages of antipsychotic compounds, such as quetiapine, haloperidol, and risperidone.

Double vision

Main article: Double vision

Double vision can be the described as the experience of duplicated vision[1][2] similar to that which occurs when one crosses their eyes. Depending on the intensity, this effect can result in a reduced ability to function and perform basic tasks which necessitate the use of sight.

The effect can easily be suppressed by simply closing one eye. This suggests that the effect may be occurring because the brain is simply overlaying the data received from both eyes on top of each other without rendering the information into a singular 3-dimensional image as it normally would during everyday life.

Double vision is often accompanied by other coinciding effects such as acuity suppression[3] and pattern recognition suppression. This effect is most commonly induced under the influence of moderate dosages of depressant and dissociative compounds, such as alcohol, quetiapine, ketamine, and DXM.

Image examples

Frame rate suppression

Frame rate suppression can be described as a perceived reduction in the speed at which visual information is processed. While under the influence of this effect one may feel as if their vision is lagging and displaying in a manner similar to a buffering video, computer monitor, or strobe light.

Frame rate suppression is often accompanied by other coinciding effects such as acuity suppression and double vision. It is most commonly induced under the influence of moderate dosages of dissociative compounds, such as ketamine, MXE, PCP, and DXM.

Pattern recognition suppression

Pattern recognition suppression can be described as a partial to complete inability to mentally process visual information regardless of its clarity. For example, although one may be able to see what is in front of them in perfect detail, they will have a reduced ability to understand what they are looking at. This can render even the most common of everyday objects as unrecognizable.

Pattern recognition suppression is often accompanied by other coinciding effects such as analysis suppression and thought deceleration. It is most commonly induced under the influence of heavy dosages of dissociative or antipsychotic compounds, such as ketamine, quetiapine, PCP, and DXM. However, it can also occur to a lesser extent under the influence of extremely heavy dosages of psychedelic compounds such as LSD, psilocybin, and mescaline.

Peripheral information misinterpretation

Peripheral information misinterpretation can be described as the experience of perceiving details within the peripheral vision incorrectly. During this state, a person may see details within their peripheral vision that are quite elaborate that, after a more direct analysis, turn out to be entirely fabricated. For example, a person may momentarily notice fleeting objects, people, or events within their peripheral vision that are not actually present.

Peripheral information misinterpretation is often accompanied and enhanced by other coinciding effects such as pattern recognition enhancement and external hallucinations. It is most commonly induced under the influence of moderate dosages of deliriant compounds, such as DPH, datura, and benzydamine. However, it can also occur under the influence of stimulant psychosis and sleep deprivation.

See also

References

  1. Watts, A. This Is It. New York: Pantheon Books, Inc., 1960.
  2. Marsh, A. (1979). Visual hallucinations during hallucinogenic experience and schizophrenia. Schizophrenia Bulletin, 5(4), 628. https://doi.org/10.1093/schbul/5.4.627
  3. Smith, J. L., & Buncic, J. R. (1999). Drugs which can affect near vision: a useful list. American Orthoptic Journal, 49, 180-190. https://uwpress.wisc.edu/journals/pdfs/AOJ_49_178.pdf