Ganzfeld

Domain VII · Transpersonal, psychedelic & altered states · Wolfgang Metzger, Hochberg, Bertini · 1930

What it is

The ganzfeld (German "whole field") is not a psychotherapy. It is a mild perceptual-deprivation procedure: the eyes see an even, featureless field of light (translucent halved ping-pong balls or goggles under a lamp) while the ears get steady noise. Within minutes most people report hypnagogic-like…

Format

• The ganzfeld is a single-session procedure; there are no treatment phases or course length. In the PRL programme 240 receivers took part in 354 sessions, i.e. most did one or two. A session runs in fixed, time-based stages; moving on is by the clock, not by clinical criteria.
• Clinical framing. If a therapist uses ganzfeld at all, treat it as an optional, one-off experiential exercise (for example in research on imagery or in work with a client who already practises it), not a course of treatment. No source specifies a clinical session count.

Who practises it, and how they are trained or regulated

• Scientific status of the psi claim, as sources report it. Contested at best. Supporters cite meta-analyses with hit rates of about 30–34% against a 25% chance rate (Bem & Honorton 1994; Storm et al. 2010, via SPR). Critics cite Milton & Wiseman's (1999) near-zero meta-analytic effect, which concluded the technique "does not at present offer a replicable method for producing ESP"; Hyman's methodological critiques;…

Questions to explore with your client

• What drew you to it, and what are you hoping it will change?
• Is there physical contact? Was it explained beforehand, and do you feel free to say no or stop at any point?
• Does it involve any substance, plant preparation, remedy or supplement? Has your doctor or prescriber been told, especially about any medication you take?
• Does it involve intense or unusual breathing? Have you been told about the medical conditions for which that is not advised?
• Is it a group, retreat or community? How do they respond if someone wants to leave or raises a concern?
• Who runs it, and what training or registration do they hold?
• What actually happens in a session or meeting, and how often?
• What does it cost, and is there pressure to commit to more?
• How do you feel afterwards, in the hours and days that follow?
• Does it fit with, or clash with, the work we do here?

What practitioners of it watch for

• high expectations, fear of "losing control", performance anxiety.
• relaxation-induced anxiety (some people get anxious as they relax); if so, keep eyes open and shorten.
• reluctance to disclose unusual experiences; a client wanting the session to prove psychic ability (explore expectations first, 4.2).
• lingering perceptual changes, disorientation, low mood or anhedonia (both rose in deprivation conditions in Daniel et al. 2014), or distress about content.
• long silences (sleep or absorption; sleepiness is greater under ganzfeld than flicker); emotional content in the imagery; signs of distress in voice or breathing.

When to involve someone else

• New or worsening physical symptoms, or advice to stop or change prescribed medication: involve the client's doctor or prescriber.
• Signs of coercion, isolation from family and friends, escalating costs or secrecy: discuss openly and consider safeguarding.
• A crisis or thoughts of suicide: follow your crisis protocol. In the US, call or text 988; in the UK and Ireland, Samaritans on 116 123.

Drawn automatically from the guide's own sections. Stay curious: neither endorse nor dismiss what the client values, and check anything that matters against the full guide and its sources. Not medical advice.