Subjective effect index
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The Subjective Effect Index (SEI) is a collection of wiki articles designed to serve as a comprehensive reference work for the diverse range of subjective effects that can occur during an altered or non-ordinary state of consciousness. It has primarily been written to describe the effects of psychoactive substances (particularly hallucinogens) but may also be extended to other areas of psychonautics such as meditation, sensory deprivation, and lucid dreaming.
Each SEI entry consists of 1) a systematic effect name 2) a phenomenological description and analysis of the effect and 3) any other relevant information. SEI articles must adhere to a formalized writing style that avoids reliance on flowery metaphors or analogies, preferring instead to use ordinary language. This decision has been adopted in the hope that these descriptions will eventually come to serve as a universal terminology set that enables individuals to better analyze and share experiences that are otherwise difficult to describe.
The SEI currently contains over 200 entries that are organized into categories based on which sense they affect and their general behavior. Many of these effects are further broken down into leveling systems, subcomponents, and style variations that are reported to occur across different substances, doses, and situations. Detailed replications, in the form of image and video examples, have been included wherever possible to supplement the text descriptions.
The contents of this index are based on the collective experiences of our contributors along with various anecdotal reports collected from the internet and the scientific literature. A curated archive of some of these reports can be found in our experience index.
Visual effects 
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Enhancements
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Suppressions
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Distortions
- After images
- Brightness alteration
- Colour replacement
- Colour shifting
- Colour tinting
- Depth perception distortions
- Diffraction
- Drifting
- Environmental cubism
- Environmental patterning
- Environmental orbism
- Object alteration
- Perspective distortion
- Recursion
- Scenery slicing
- Symmetrical texture repetition
- Texture liquidation
- Tracers
- Visual flipping
- Visual haze
- Visual stretching
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Geometry
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Hallucinatory states
Cognitive effects 
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Enhancements
- Analysis enhancement
- Anxiety
- Creativity enhancement
- Dream potentiation
- Ego inflation
- Emotion enhancement
- Empathy, affection, and sociability enhancement
- Focus enhancement
- Immersion enhancement
- Increased music appreciation
- Increased sense of humor
- Irritability
- Memory enhancement
- Motivation enhancement
- Novelty enhancement
- Personal meaning enhancement
- Suggestibility enhancement
- Thought acceleration
- Thought connectivity
- Thought organization
- Wakefulness
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Suppressions
- Addiction suppression
- Amnesia
- Analysis suppression
- Anxiety suppression
- Cognitive fatigue
- Confusion
- Creativity suppression
- Delirium
- Disinhibition
- Dream suppression
- Emotion suppression
- Focus suppression
- Language suppression
- Memory suppression
- Motivation suppression
- Personal bias suppression
- Sleepiness
- Suggestibility suppression
- Thought deceleration
- Thought disorganization
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Novel
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Psychological
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Transpersonal
Uncomfortable physical effects 
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Cardiovascular
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Cerebrovascular
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Bodily
- Back pain
- Bodily pressures
- Constipation
- Dehydration
- Diarrhea
- Difficulty urinating
- Dry mouth
- Frequent urination
- Increased phlegm production
- Increased perspiration
- Increased salivation
- Itchiness
- Muscle cramps
- Muscle twitching
- Muscle tension
- Nausea
- Optical sliding
- Photophobia
- Physical fatigue
- Respiratory depression
- Restless legs
- Runny nose
- Salivation
- Skin flushing
- Stomach bloating
- Stomach cramp
- Teeth grinding
- Temporary erectile dysfunction
- Vibrating vision
- Watery eyes