Embodiment, body schema, and neuroscience

Botvinick and Cohen (1998) stroked a rubber hand in time with a hidden real hand, and participants shifted the felt location of the hand toward the rubber one. Later work moved the effect to whole bodies. Ehrsson (2007) induced an out-of-body illusion. Lenggenhager, Tadi, Metzinger, and Blanke (2007) manipulated self-location with a virtual body. Petkova and Ehrsson (2008) reported a body-swap illusion. Slater, Spanlang, Sanchez-Vives, and Blanke (2010) reported a first-person body-transfer illusion in virtual reality.

The established finding is narrow and strong: given the right multisensory match, healthy adults can feel ownership of a body that is not theirs, for a little while, and they know it is an experiment. Species identity is a durable self-description, usually without a rig and without loss of the knowledge that one's organism is human. The illusion literature is proof that ownership is construction-like. It is a candidate mechanism only by analogy.

Botvinick and Cohen (1998), Nature, 391, 756. Ehrsson (2007), Science, 317, 1048. Lenggenhager et al. (2007), Science, 317, 1096. Petkova and Ehrsson (2008), PLoS ONE, 3(12), e3832. Slater et al. (2010), PLoS ONE, 5(5), e10564. Standard references. This build used them as the canonical papers, not as fresh replications run here.

E1 for the illusions as laboratory phenomena (replicated class of effects, arguments about boundary conditions notwithstanding). E3 as an etiology of therian or otherkin experience. No study opened for this site put therians through a rubber-hand or full-body protocol.

Illusions need a stimulus and collapse when the match breaks. Therian reports often do not. Knowing one is in a lab is part of the effect's ethics and its limit: insight is preserved, which actually makes the analogy to non-delusional identity more interesting, and still untested. Clinical lycanthropy, where insight fails, is a different comparison. See D18.

The embodiment-lab study in the gaps: therians versus matched controls on illusion susceptibility, plus a structured phantom-sensation protocol.

• C15 Phantom analogy
• C14 Proteus
• H47 Phenomenology

Yee and Bailenson (2007) assigned virtual bodies. Participants given taller or more attractive avatars behaved more confidently in negotiation and self-disclosure tasks. The Proteus effect is the finding that a digital body leaks into behavior.

A fursona is an avatar with a biography. If the effect survives outside the lab, practicing a confident wolf in a suit or on a screen could train confident behavior, which is one way a persona earns its keep. The effect is about behavior and self-perception in a session. It is the best available experimental bridge from persona-play to felt self. It is not a bridge to "I am a non-human animal" as a standing identity. Assigned fox avatars do not produce fox therians.

Yee and Bailenson (2007), Human Communication Research, 33(3), 271-290. Later Proteus replications exist and were not systematically reviewed for this site. Furscience 3.12 is the field analogue, not an experiment.

E2 for the original experiments and their replications as a class (single paradigm, real effects, arguments about size). E3 for fursonas. Nobody in the opened literature randomly assigned fursonas and measured year-long self-concept.

People choose avatars that already fit them, so the lab's random assignment is doing work that real fursonas do not. Demand effects and short tasks inflate confidence claims. A persona used only for sex, humor, or art may never touch the everyday self. The ideal-self data are compatible with Proteus and also with a simpler story: people draw who they wish they were, and drawing changes nothing.

Randomize, for willing new participants, a social-trait brief on a persona they already have, and measure in-fandom and out-of-fandom behavior a month later.

• A3 Possible selves
• G41 Platforms and VRChat
• C13 Body ownership

Maravita and Iriki (2004) reviewed tool incorporation: using a rake can extend both action and, in the primate and human evidence they assemble, the body schema. Merleau-Ponty's cane, the classic philosophical example, belongs with this evidence rather than instead of it. Melzack's neuromatrix account (1990) and Ramachandran's phantom-limb work treat the felt body as a construction that can include a limb the eyes do not see. Supernumerary phantom limbs, extra felt limbs after certain brain lesions, show that the schema can add, not only subtract.

Therian communities name "phantom shifts": a felt tail, ears, wings, muzzle. Clegg and Roxburgh are listed in a 2014 repository record for work titled "Phantom limbs in the therian community." [unverified: do not rely] This build did not retrieve a journal venue or a sample size for that paper. It is not used for a number. The self-reports remain E5. The neurological phenomena are E1-E2. The claim that the same mechanism produces phantom tails in intact, insightful people is E3.

Maravita and Iriki (2004), Trends in Cognitive Sciences, 8(2), 79-86. Melzack (1990), Trends in Neurosciences, 13(3), 88-92. Ramachandran and Hirstein (1998), Brain, 121, 1603-1630. Supernumerary phantom limbs: neurological case literature, not re-reviewed case by case here. Community term defined on Distinctions.

Split on purpose. Do not let the rubber-hand and phantom-limb reputation launder a self-report into a brain finding.

Tool incorporation tracks a tool that is actually held. Phantom pain tracks deafferentation and cortical maps of a former limb. A never-owned tail has no such history. Expectation, attention, and a community script can produce vivid body sensations. That alternative is not a dismissal of the report. It is the control condition a lab would need. Vividness also varies: many therians report no phantoms, and the identity persists in those reports. A phantom theory cannot be the whole identity theory.

See the phantom-shift lab design in the gaps. Prediction if the analogy is doing real work: higher illusion susceptibility and repeatable, modality-specific sensation without loss of insight. A null result would retire the analogy as an explanation, and would leave the reports untouched as reports.

• C13 Illusions
• H47 Merleau-Ponty
• D18 Clinical cases, where sensation and delusion co-occur

Tellegen and Atkinson (1974) measured absorption: the tendency to have one's representational resources fully engaged by an object of attention. Wilson and Barber (1983) described a fantasy-prone pattern: vivid imagery, strong childhood imagination, sometimes confusion of fantasy and memory at the edges, in a small intensive sample of excellent hypnotic subjects. These traits predict rich inner experience. They are a natural place to look if shifts, phantom sensations, and fursona immersion are imaginative events that feel real.

This build found no study that correlates absorption or fantasy-proneness with therian identity, fursona immersion, or shift frequency. The gap is the finding.

Tellegen and Atkinson (1974), Journal of Abnormal Psychology, 83(3), 268-277. Wilson and Barber (1983), in Sheikh, ed., Imagery: Current Theory, Research, and Application. Standard references, not re-read in full.

E2 for the traits as psychometric constructs (absorption has a long measurement history; fantasy-proneness began in a small selected sample and should not be over-sold). E3 for the application, and only as a hypothesis. Using the traits to imply that therians "live in fantasy" would be an inflation this site will not make.

High absorption is common in artists, readers, and people who pray or meditate. It is not a pathology and not a species. A theory that stops at "they are imaginative" cannot see the many imaginative people who do not identify as animals, or the therians who describe the identity as flat, constant, and unremarkable rather than trance-like.

Add the Tellegen Absorption Scale and a fantasy-proneness inventory to a therian-versus-fursona-only-versus-neither design. Pre-register the prediction that absorption tracks shift reports and fursona immersion, and does not by itself track the identity claim.

• B8 Childhood imagination
• C15 Phantoms
• Gaps

Dissociative identity disorder, in the DSM-5 framework, involves a disruption of identity with marked discontinuity in the sense of self and of agency, plus clinically significant distress or impairment. Culturally accepted possession is handled carefully by the manual for a reason: unusual self-experience is not automatically a disorder. A therian who reports a continuous human life, remembers it, and knows their body is human is not describing that syndrome.

Community vocabulary includes plurality (more than one self in a life) and tulpamancy (deliberately cultivated additional agents). Some therians are plural and some are not. The communities generally reject a pathology frame for the species identity itself. That rejection is E5, a belief about the belief. It is also consistent with the clinical guidance in Roberts et al. (2015): assess functioning, do not diagnose the identity.

Scholarship on tulpamancy exists. This build did not verify a specific paper's methods, so no tulpamancy result is cited. The adjacent phenomenon is named so it is not silently merged with therianthropy.

American Psychiatric Association, DSM-5-TR, dissociative identity disorder criteria, paraphrased rather than quoted. Grivell et al. (2014) and Clegg et al. (2019), which did not find a simple "this is mental illness" picture. Roberts et al. (2015). Community terms on Distinctions.

E2 for the diagnostic construct and for the small therian mental-health studies. E3 for the claim that species identity is psychologically independent of dissociation in general. E5 for plural and tulpa taxonomies.

Some people meet criteria for a dissociative disorder and also use therian or plural labels. Exclusion is not the same as immunity. Online communities can coach people to interpret ordinary inner speech as separate agents. That risk is a reason for careful assessment. It is not a finding that the labels are disorders.

A structured dissociative-disorder interview in a therian sample and in a psychiatric control sample, with the interviewer blind to the identity label. The prediction from the non-pathologizing view: most therians do not meet dissociative-identity criteria. The prediction from a dissociation theory: they do. Either result would teach something. Neither has been published in the sources opened here.

• D18 Clinical lycanthropy
• D19 Dysphoria
• H49 Testimony