Lasting Changes in Personal Values Induced by Psilocybin in Healthy Volunteers

A recent study led by Jess Kerr-Gaffney at King’s College London explored the effects of psilocybin on healthy volunteers, focusing on changes in personality traits, psychological symptoms, and personal values. The research team, which included James Rucker and clinical researchers from the Institute of Psychiatry, Psychology and Neuroscience, conducted a double-blind, randomized, placebo-controlled trial involving eighty-nine participants without psychiatric disorders. Participants received either twenty-five milligrams, ten milligrams of psilocybin, or an inactive placebo in a controlled clinical setting.

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Participants were evaluated at day eight and day eighty-five post-dosing using standardized questionnaires to assess personality traits such as extraversion and openness, as well as psychiatric symptoms like anxiety. A specialized survey, originally designed for near-death experiences, measured shifts in personal values, including self-acceptance and concern for others. The study found that while psilocybin did not alter basic personality traits or psychiatric symptoms, significant shifts in personal values were observed among those who received the drug compared to the placebo group. Participants reported increased appreciation for life, higher self-acceptance, and a stronger quest for meaning, with these changes persisting at follow-up assessments.

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The researchers identified a specific aspect of the psychedelic experience termed "oceanic boundlessness," characterized by feelings of euphoria and spiritual awakening. Participants who experienced higher levels of this state reported more significant positive shifts in their life values. Additionally, some participants who experienced auditory alterations during the drug's effects showed short-term increases in social and planetary concerns.

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The study also assessed cognitive flexibility, the ability to switch between different concepts, using a rule-learning task one week after dosing. No significant differences were found between the psilocybin and placebo groups, possibly due to the participants' pre-existing high cognitive flexibility. The researchers acknowledged several limitations, including the potential for functional unblinding, as participants might have guessed whether they received the drug. Many volunteers had prior psychedelic experiences, which could have influenced their expectations and baseline traits.

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Critics of the study point to the reliance on self-reported data for measuring personal value changes, which may introduce recall bias. The authors suggest that future research should involve larger participant groups and consider using an active placebo to maintain blinding. They also recommend testing these value changes in clinical populations to better understand their implications for psychological healing.

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The study titled “Effects of psilocybin on personality, psychiatric symptoms, and values: Exploring mediating effects of the acute psychedelic experience” highlights the potential of psilocybin to induce lasting changes in personal values among healthy individuals, while also emphasizing the need for further research to validate these findings and explore their therapeutic applications.

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