Discovery Lab Answers

The sources retrieved for this question give a view of LeShan primarily through book reviews and a conference paper rather than raw experimental data, so what follows is grounded in what those sources establish, supplemented by clearly labeled general background where the retrieved excerpts do not reach.

Lawrence LeShan — Work and Experimental Context

Who LeShan was and what he investigated

Lawrence LeShan (1920–2020) was a psychologist affiliated with the Department of Psychiatry and Religion at Union Theological Seminary, New York ^[3]. His work sat at the intersection of consciousness research, psychic healing, and theoretical parapsychology. He is best known for two intellectual contributions: a framework distinguishing multiple “realities” (sensory, clairvoyant, transpersonal), and a structured training approach intended to induce the altered states he believed were associated with psi phenomena.

The theoretical framework

LeShan’s core argument, developed across several books and laid out in conference form ^[3], was that psi phenomena make sense only within a particular kind of altered consciousness — what he called the “clairvoyant reality” — and that conventional experimental parapsychology struggled partly because it tried to produce psi effects within an ordinary sensory-reality frame. His 1974 book The Medium, the Mystic, and the Physicist ^[2] formalized this into what he called a general theory of the paranormal, drawing parallels among the experiential frameworks reported by mediums, mystics, and physicists working in quantum mechanics.

In Landscapes of the Mind ^[1], reviewed in 2014, LeShan extended the project toward what the reviewer calls “worldview-making” — the argument that a person’s operative model of reality shapes what they can experience and report, including ostensibly paranormal experience.

The healing experiments

LeShan conducted structured experiments in psychic healing — having trained healers attempt to produce measurable physiological or clinical effects in patients at a distance, after entering what he described as a specific unitive altered state. His training protocol involved step-by-step induction of that state ^[2]. These are the experiments most often associated with his name in the primary literature.

The retrieved excerpts describe the training method and the theoretical rationale ^[2][3] but do not contain the raw numerical results (sample sizes, effect sizes, or statistical tests) from those healing trials. The source text at those points does not carry intact statistical tables. If you are looking for specific figures from LeShan’s healing studies, the primary sources to consult are his own published reports and the secondary analyses in The Medium, the Mystic, and the Physicist — the retrieved excerpts do not surface them.

Psi and altered states — the theoretical claim at the conference

At the 1984 Science & Consciousness conference, LeShan argued explicitly that resolving the relationship between psi and altered states of consciousness first required clarifying the underlying assumptions researchers bring to that relationship ^[3]. His position was that methodological disagreements in the field were downstream of unexamined ontological commitments — researchers who assumed a purely sensory reality would design experiments that, by design, could not detect effects that only appear in a different frame.

Montague Ullman, chairing that session, noted the relevance of the framework as a prelude to the morning’s discussion of dreams and psi ^[3].

Skeptical critiques

The retrieved sources are book reviews and a conference abstract; they do not carry formal skeptical engagement with LeShan’s experimental results at the level of a published critique or reanalysis. What can be said from general background, clearly labeled as such:

Critics of LeShan’s healing experiments have argued that his training studies lacked adequate controls for expectancy effects and that the “altered state” criterion was subjectively defined and not independently verifiable — making it difficult to distinguish a genuine state-dependent psi effect from demand characteristics or experimenter influence. The theoretical framework itself has been challenged on the grounds that mapping quantum-mechanical descriptions onto consciousness is a category error. Neither the specific critique nor the specific rebuttal is present in the retrieved sources, so those characterizations should be verified against the primary critical literature rather than taken from this answer.

For broader context on psi and consciousness research, the Phenomena section and Foundations section at ESP-Nexus are the relevant starting points.