European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology
May 1, 2022
Isabel Wießner, Rodolfo Olivieri, Marcelo Falchi et al.
42 citations
A low dose of LSD (50 μg) produces both beneficial and detrimental cognitive effects 24 hours after administration. Compared to placebo, LSD sub-acutely improved visuospatial memory and phonological verbal fluency but impaired cognitive flexibility, as measured by fewer categories achieved and more perseveration on the Wisconsin Card Sorting Test. The findings suggest that LSD-assisted therapy might be explored for conditions involving memory and language decline, such as brain injury, stroke, or dementia, while also indicating a mixed 'afterglow and hangover' profile.
Experimental Neurology
June 1, 2022
I. Ornelas, F. A. Cini, Isabel Wießner et al.
37 citations
LSD treatment improved performance in a novel object recognition task in rats and a visuo-spatial memory task in humans. A proteomic analysis of human brain organoids showed that LSD affected metabolic pathways associated with neural plasticity, including mTOR. Simulations using a neural network model of a cortico-hippocampal circuit, with baseline plasticity strength as a proxy for age and increased plasticity related to LSD dose, fit the experimental data well. The results suggest that LSD has nootropic effects.
European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology
March 1, 2023
Isabel Wießner, Marcelo Falchi, Dimitri Daldegan-Bueno et al.
6 citations
Low to moderate doses of LSD alter language structure, semantics, and vocabulary over time. In a double-blind, placebo-controlled crossover study, 24 healthy volunteers (age 35±11, 33% women) received 50 μg LSD or placebo. LSD reduced verbosity, lexicon, and connectivity in speech networks from 1.5 to 4 hours, decreased semantic distances between words from 2 to 24 hours, and shifted vocabulary related to grammar, persons, time, space, and biological processes from 1.5 to 24 hours. Simpler, disconnected structure and increased semantic similarity may reflect cognitive impairments, while vocabulary changes may indicate subjective perceptual shifts. Automated language analysis could offer unconstrained insights into psychedelic cognition.
The International journal on drug policy
November 1, 2024
Rodolfo Olivieri, Luís Fernando Tófoli
1 citation
In mid-20th century Argentina, psychoanalysts Luisa de Álvarez de Toledo, Alberto Tallaferro, and Alberto Fontana combined psychoanalytic therapy with psychedelic substances such as LSD. Their clinical work suggested that psychedelics could enhance transference, trigger catharsis, and bypass unconscious defenses, enabling vivid exploration of patients' psyches that required interpretation. Resistance from the Argentine Psychoanalytic Association eventually ended this research. The essay argues that renewed dialogue about psychedelics in contemporary therapeutic practice is warranted, highlighting an overlooked chapter in psychoanalysis and urging engagement with emerging research.