After images (also known as palinopsia) are visual perceptions that continue to appear in one's vision after exposure to the original image has ceased. They are most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

An autonomous entity is the experience of perceived contact with beings that appear to be sentient in their behaviour. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds.

Brightness alteration is a distortion or change in the intensity of perceived brightness comprising a person's vision. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and cannabinoids.

Colour enhancement is a perceived intensification of the brightness and vividness of colours in the external environment. It is most commonly induced under the influence of mild dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Colour shifting is when objects within the environment fluidly change their colour through a continuously repeating cycle. It is most commonly induced under the influence of psychedelic compounds.

Depth perception distortions are alterations in how a person perceives the distance of various objects within their visual field. They are most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Diffraction is the experience of seeing rainbows and spectrums of colour embedded within the brighter parts of a person's visual field. It is most commonly induced under the influence of mild dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Drifting is the experience of the texture, shape, and general structure of objects and scenery appearing progressively warped, melted, and morphed across themselves. It is most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

An external hallucination is the perception of a visual hallucination that displays itself seamlessly into the external environment as if it were physically present. They are most commonly induced under the influence of heavy dosages of deliriant compounds.

Geometry is the experience of a person's field of vision becoming partially or completely encompassed by fast-moving, colourful, and extremely complex geometric patterns, form constants, shapes, fractals, and colours.

Increased pareidolia is an increase in a person's ability and tendency to recognise patterns (usually faces) within vague stimuli. It is most commonly induced under the influence of mild dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

An internal hallucination is the perception of a visual hallucination that exclusively occurs within an imagined environment that can typically only be viewed with closed eyes, similar to those found within dreams. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and deliriants.

A perspective hallucination is an alteration of the perspective through which a given internal or external hallucination is seen through. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and deliriants.

Pupil dilation can be described as the enlargement of the size of a person's pupils under normal lighting conditions. This is most commonly induced under the influence of moderate dosages of a wide variety of serotonergic compounds, such as psychedelics, dissociatives, deliriants, entactogens, various stimulants, and some antidepressants.

Settings, sceneries, and landscapes are the perceived environments in which the plot of an internal or external hallucination occurs. This effect is capable of manifesting in a seemingly infinite variety of potential places and settings. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and deliriants.

Symmetrical texture repetition is the perception of textures becoming mirrored repeatedly over their own surface in an intricate and symmetrical fashion that is consistent across itself. It is most commonly induced under the influence of mild dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Tracers are the experience of visual trails of varying lengths and opacity being left behind moving objects. They are most commonly induced under the influence of mild dosages of psychedelic compounds.

Transformations are the experience of a perceived visual metamorphosis that specific parts of one's external environment undergo as they shapeshift into other objects. They are most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Visual acuity enhancement is a heightening of the clearness and clarity of vision. It is most commonly induced under the influence of mild dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Visual exposure to semantic concept network is the experience of percieving a seemingly infinite mass of complex interconnected geometric forms comprised entirely of innately understandable representations. These individual geometric representations are perceived to simultaneously convey every internally stored concept and memory contained within the mind.

Physical euphoria can be described as feelings of pleasure and comfort within and across one's body. This euphoria typically feels somewhat comparable to the endorphin rushes felt during states of excitement or love, the coziness of a comfortable bed, and the rush of an orgasm. It is most commonly induced under the influence of heavy dosages of a wide variety of compounds, such as opioids, stimulants, psychedelics, and GABAergics.

Appetite suppression can be described as the experience of a distinct decrease in a person's sense of hunger and appetite in a manner which can result in both a lesser desire to eat food and a decreased enjoyment of its taste. It is most commonly induced under the influence of moderate dosages of stimulant compounds, such as amphetamine, methylphenidate, nicotine, MDMA, and cocaine.

Bodily control enhancement can be described as feeling as if there has been a distinct increase in a person's ability to control their physical body with precision, balance, coordination, and dexterity. It is most commonly induced under the influence of moderate dosages of stimulating psychedelics, such as LSD, 2C-B, and DOC.

Dehydration can be described as an uncomfortably dry mouth and feelings of general thirstiness that results due to a lack of water intake. It is most commonly induced under the influence of moderate dosages of a wide variety of compounds such as, stimulants, psychedelics, opioids, dissociatives, deliriants, cannabinoids, alcohol, and antipsychotics.

Difficulty urinating (also known as urinary retention) can be described as the experience of a decreased ability to pass urine. It is most commonly induced under the influence of heavy dosages of stimulant and opioid compounds, such as heroin, fentanyl, kratom, amphetamine, MDMA, and 4-FA.

Excessive yawning can be described as the experience of repeated, intensified, overly frequent, and spontaneous yawning despite a complete absence of genuine sedation or sleepiness. It is most commonly induced under the influence of moderate dosages of tryptamine psychedelic compounds, such as psilocybin, 4-AcO-DMT, 4-HO-MET, and ayahuasca.

Frequent urination, or urinary frequency, can be defined as the need to urinate more often than usual. It is most commonly induced under the influence of moderate dosages of a wide variety of compounds, such as stimulants, psychedelics, dissociatives, and deliriants.

A headache can be described as a pain anywhere in the region of the head or neck. It can be a symptom of a number of different conditions. They are most commonly induced under the influence of heavy dosages of stimulating compounds, such as traditional stimulants, certain psychedelics, and certain dissociatives.

Increased blood pressure can be described as a condition in which the pressure in the systemic arteries is elevated to abnormal levels. It is most commonly induced under the influence of heavy dosages of deliriants and vasoconstricting compounds, such as traditional stimulants and stimulating psychedelics.

Increased bodily temperature or pyrexia can be described as having a body temperature which is above normal baseline. It is most commonly induced under the influence of heavy dosages of stimulant compounds which affect serotonin and 5-HT receptors, dopamine and D receptors and norepinephrine.

Increased heart rate or tachycardia is described as a heart rate that is faster than the normal heart rate at rest. It is most commonly induced under the influence of heavy dosages of stimulating compounds, such as traditional stimulants, certain psychedelics, and certain dissociatives.

Increased perspiration, or hyperhidrosis, can be described as a condition characterized by increased sweat which is in excess of that required for the regulation of body temperature. It is most commonly induced under the influence of stimulants, psychedelics, and benzodiapine or alcohol withdrawals.

Laughter fits can be described as the experience of uncontrollable, intense, and spontaneous laughter which continue to occur despite a lack of any identifiable trigger or a feeling of humorousness. They are most commonly induced under the influence of moderate dosages of psychedelic and dissociative compounds, such as LSD, psilocybin, and nitrous oxide.

Mouth numbing is a physical side effect of administering certain drugs sublingually (under the tongue) or buccally (via the cheeks and gum). The effect can be described as a distinct feeling of general numbness or tactile suppression around the tongue and mouth which can last for up to an hour after the drug has been administered.

A muscle cramp can be described as an involuntary temporary contraction or over shortening of muscles which may cause severe aches and pains. They are most commonly induced under the influence of heavy dosages of stimulating psychedelic compounds, such as LSD, 2C-E, DOC, and AMT. However, they can also occur under the influence of certain GABAergic depressants such as GHB and phenibut.

Nausea can be described as a sensation of unease and discomfort in the upper stomach combined with an involuntary urge to vomit. It is most commonly induced under the influence of heavy dosages of a wide variety of compounds, such as psychedelics, opioids, GABAergics, deliriants, dissociatives, and stimulants.

Perception of bodily lightness can be described as feeling as if one's body has significantly decreased in its weight. This can result in feelings of increased energy and a general sense of bounciness due to the body seeming weightless and therefore effortless to move. It is most commonly induced under the influence of moderate dosages of dissociative compounds, such as ketamine, PCP, and DXM.

An epileptic seizure (colloquially a fit) can be described as a brief episode of signs and/or symptoms which are due to abnormal, excessive, or synchronous neuronal activity in the brain. They are most commonly induced under the influence of withdrawals from prolonged chronic benzodiazepine or alcohol usage.

Stamina enhancement can be described as an increased ability to engage in physically and mentally taxing activities without the development of fatigue. It most commonly occurs under the influence of stimulants such as amphetamine and specific psychedelics such as LSD.

Stimulation can be described as an increase in a person's physical energy levels. It is most commonly induced under the influence of stimulant compounds, such as amphetamine, MDMA, and cocaine.

Teeth grinding (also known as bruxism, jaw clenching, and gurning) can be described as a compulsive and often uncontrollable urge to grind one's teeth. It is most commonly induced under the influence of common dosages of stimulant compounds, such as methamphetamine, MDMA, methylphenidate, and cocaine. However, it can also occur under the influence of certain stimulating psychedelics such as 2C-E, DOC, and AMT.

Temperature regulation suppression can be defined as an inability to maintain a normal temperature. It is most commonly induced under the influence of heavy dosages of stimulating psychedelic compounds, such as LSD, 2C-B, and AMT.

Vasoconstriction can be described as a narrowing of the veins and blood vessels which results from a contraction of their muscular wall. It is most commonly induced under the influence of moderate dosages of stimulating psychedelic compounds, such as LSD, 2C-E, and DOC.

Watery eyes can be described as a physical effect which results in a state of continuous involuntary streaming, tearing, crying, and watering of the tear ducts within one's eyes. It is most commonly induced under the influence of moderate dosages of psychedelic tryptamine compounds, such as psilocybin, 4-AcO-DMT, and 4-HO-MET.

An auditory distortion is the experience of perceived alterations in how audible noises present and structure themselves. They are most commonly induced under the influence of hallucinogenic compounds.

An auditory enhancement is the experience of an increase or improvement of the acuteness and clarity of sound. They are most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

An auditory hallucination is the experience of hearing spontaneous and imaginary noises. They are most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, deliriants, and dissociatives.

Muscle twitching can be described as the sensation of small and localised tremblings of muscle groups. These vibrations are often powerful enough to be visibly seen through the skin. It is most commonly induced under the influence of moderate dosages of stimulating psychedelic compounds such as LSD, 2C-E, DOC, and AMT.

Spontaneous tactile sensations are the experience of sensations across the body occurring without any obvious or immediate physical trigger. This results in feelings of seemingly random yet distinct tingling sensations that occur across the skin and within the body. Depending on the psychoactive substance consumed, these vary greatly in their styles of sensation.

An olfactory hallucination (also known as phantosmia) is the detection or perception of a convincing imaginary smell that is not actually present in the person's environment. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as deliriants and psychedelics.

Analysis enhancement is a perceived improvement of a person's overall ability to logically process information or creatively analyze concepts, ideas, and scenarios. It is most commonly induced under the influence of moderate dosages of stimulant and nootropic compounds, such as amphetamine, methylphenidate, nicotine, and caffeine.

Anxiety is medically recognized as the experience of negative feelings of apprehension, worry, and general unease. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as cannabinoids, psychedelics, dissociatives, and deliriants

Conceptual thinking is an alteration to the nature and content of one's internal thought stream. This alteration predisposes a user to think thoughts that are no longer primarily comprised of words and linear sentence structures. Instead, thoughts become equally comprised of what is perceived to be extremely detailed renditions of the innately understandable and internally stored concepts that words exist to label. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics and dissociatives.

Confusion is an impairment of abstract thinking demonstrated by an inability to think with one’s customary clarity and coherence. It is most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics, dissociatives, synthetic cannabinoids, and deliriants.

Déjà Vu or Deja Vu can be described as the sudden sensation that a current event or situation has already been experienced at some point in the past when, in actuality, it hasn't. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and cannabinoids.

Existential self-realization can be described as a sudden realization, revelation, or reaffirmation of a person's existence within this universe. Existential self-realization is most commonly induced under the influence of moderate dosages of psychedelic and dissociative compounds such as ketamine, LSD, 4-AcO-DMT, and DCK.

Immersion enhancement is an effect that results in a pronounced increase in one's tendency to become fully captivated and engrossed by external stimuli, such as film, TV shows, video games, and various other forms of media. It is most commonly induced under the influence of moderate dosages of dissociative compounds, such as ketamine, PCP, and DXM.

Increased music appreciation is a general sense of an increased enjoyment of music. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and cannabinoids

Increased sense of humor is as a general enhancement of the likelihood and degree to which a person finds stimuli to be humorous and amusing. It is most commonly induced under the influence of moderate dosages of certain hallucinogenic compounds, such as psychedelics, mescaline, and cannabinoids.

Introspection can be described as the experience of a state of mind in which a person feels as if they are being encouraged or forced to reflect upon and examine aspects of their life, thoughts, and feelings. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics and dissociatives.

Language suppression is the decreased ability to use and understand speech. It is most commonly induced under the influence of heavy dosages of antipsychotic compounds, such as quetiapine, haloperidol, and risperidone.

Memory suppression is an inhibition of a person's ability to maintain a functional short and long-term memory. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and deliriants.

Novelty enhancement is a feeling of increased fascination, awe, and appreciation attributed to specific parts or the entirety of one's external environment. It is most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Paranoia is the suspiciousness or the belief that one is being harassed, persecuted, or unfairly treated. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as cannabinoids, psychedelics, dissociatives, and deliriants.

Perception of eternalism can be described as the experience of a major alteration of one's perspective of the fundamental mechanics behind the linear continuity of time moving from the past, to the present, to the future. It is most commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Perception of interdependent opposites can be described as the experience of a powerful subjective feeling that reality is based upon a binary system in which the existence of fundamentally important concepts or situations logically arise from and depend upon the co-existence of their opposite. It is most commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Perception of self-design can be described as the experience of feeling that one is personally responsible for the creation, design, manifestation of a concept, process, or event which is normally seen as the result of unrelated external causes. It is most commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Personal bias suppression is a decrease in the cultural biases that a person filters their perception through. It is most commonly induced under the influence of hallucinogenic substances.

Spirituality enhancement can be described as the experience of a shift in a person’s personal beliefs regarding their existence and place within the universe, their relationship to others, and what they value as meaningful in life. It is most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

Thought acceleration (also known as racing thoughts) is the experience of thought processes being sped up significantly in comparison to that of everyday sobriety. It is most commonly induced under the influence of moderate dosages of stimulant and nootropic compounds, such as amphetamine, methylphenidate, modafinil, and MDMA.

Thought connectivity is an alteration of a person's thought stream which is characterized by a distinct increase in wandering thoughts which connect into each other through a fluid association of ideas. It is most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.

A thought loop is the experience of becoming trapped within a chain of thoughts, actions and emotions which repeats itself over and over again in a cyclic loop. Thought loops are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics and dissociatives. However, they can also occur to a lesser extent under the influence of extremely heavy dosages of stimulants and benzodiazepines.

Time distortion is an effect that makes the passage of time feel wildly altered and difficult to keep track of. is most commonly induced under the influence of strong dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and cannabinoids.

Unity and interconnectedness refers to a feeling in which one's sense of self becomes temporarily expanded to include one or more concepts or systems that would not typically be included within one’s sense of individual identity. It most commonly occurs under the influence of psychedelic and dissociative compounds, such as LSD, DMT, ayahuasca, mescaline, and ketamine.

Wakefulness is an increased ability to stay conscious without feeling sleepy combined with a decreased need to sleep. It is most commonly induced under the influence of moderate dosages of a wide variety of compounds such as stimulants, nootropics, and psychedelics.

Scenarios and plots are the situations, stories, and events that occur within both external and internal hallucinations. They are most commonly induced under the influence of heavy dosages of hallucinogenic compounds, such as psychedelics, dissociatives, and deliriants.

Synaesthesia (also spelt synesthesia or synæsthesia) is the experience of a blending, merging, or mixing of the senses. Synaesthesia is commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.