Skip to main content

Effect Index

Effect Index, is a resource dedicated to establishing the field of formalised subjective effect documentation. It is the home of the Subjective Effect Index (SEI), which contains 233 effect descriptions that exist to serve as a comprehensive map of all potential experiences that can occur under the influence of any class of psychoactive compound, particularly hallucinogens.

About Us

Thank you Emergence Benefactors!

Emergence Benefactors logo
Thank you to our wonderful sponsor, Emergence Benefactors

Mailing List

Sign up for the Effect Index list

Substance Summaries

Hallucinogenic substance classes, broken down and described

For more, see the articles section.

Featured Effects

A selection of subjective effects that best represent the SEI

For more, see the Subjective Effect Index.

Featured Article

Analyses that go beyond individual subjective effects

Psychedelic Intensity Scale

Wednesday, April 21 2021 · 9 min read

Inspired by the Shulgin Rating Scale, this article attempts to model the overall psychedelic experience as a systematic progression of seven levels.

For more, see the articles section.

Featured Replications

Artistic representations of specific subjective effects

Getting lost in a Hemp Field

A replication of Recursion

by Symmetric Vision

For more, see the replications gallery.

Featured Reports

Recommended firsthand accounts of hallucinogenic experiences

Wintry Void

by nervewing

Memantine

150 mg Oral

Wracked with Color

by nervewing

4-HO-MET

30 mg Oral in Gel Cap

LSD

4 tabs Oral

Salvia divinorum

2 bowls of 20x extract Smoked

3-HO-PCP

10 mg Intranasal

DiPT

70 mg oral

Extreme Psychosis

by Cocoanatta

Combination

2C-E

25mg Oral

For more, see the reports section.