The effects of microdose LSD on time perception: a randomised, double-blind, placebo-controlled trial

Yanakieva, S.; Polychroni, N.; Family, N.; Williams, L. T. J.; Luke, D. P. and Terhune, Devin Blair. 2019. The effects of microdose LSD on time perception: a randomised, double-blind, placebo-controlled trial. Psychopharmacology, 236(4), pp. 1159-1170. ISSN 0033-3158 [Article]

Yanakieva_et_al-2018-Psychopharmacology.pdf - Published Version
Available under License Creative Commons Attribution.

Download (661kB) | Preview

Abstract or Description

Previous research demonstrating that lysergic acid diethylamide (LSD) produces alterations in time perception has implications for its impact on conscious states and a range of psychological functions that necessitate precise interval timing. However, interpretation of this research is hindered by methodological limitations and an inability to dissociate direct neurochemical effects on interval timing from indirect effects attributable to altered states of consciousness.

We conducted a randomised, double-blind, placebo-controlled study contrasting oral administration of placebo with three microdoses of LSD (5, 10, and 20 μg) in older adults. Subjective drug effects were regularly recorded and interval timing was assessed using a temporal reproduction task spanning subsecond and suprasecond intervals.

LSD conditions were not associated with any robust changes in self-report indices of perception, mentation, or concentration. LSD reliably produced over-reproduction of temporal intervals of 2000 ms and longer with these effects most pronounced in the 10 μg dose condition. Hierarchical regression analyses indicated that LSD-mediated over-reproduction was independent of marginal differences in self-reported drug effects across conditions.

These results suggest that microdose LSD produces temporal dilation of suprasecond intervals in the absence of subjective alterations of consciousness.

Item Type:


Identification Number (DOI):

Additional Information:

The clinical trial was funded by Eleusis Benefit Corporation (USA). This work was supported in part by a Marie Skłodowska-Curie Intra-European Fellowship within the 7th European Community Framework Programme to DBT.


Interval timing, LSD, Microdosing, Older adults, Striatum

Departments, Centres and Research Units:

Psychology > Timing, Awareness, and Suggestion Lab


9 November 2018Accepted
26 November 2018Published Online
April 2019Published

Item ID:


Date Deposited:

28 Nov 2018 09:13

Last Modified:

12 Mar 2021 17:44

Peer Reviewed:

Yes, this version has been peer-reviewed.


View statistics for this item...

Edit Record Edit Record (login required)