---
id: "20260725-0215-verify-the-blanke-2002"
title: "Verify the Blanke 2002 (Nature) and 2014 (Current Biology) quotes verbatim against the primary papers"
type: "capture"
status: "promoted"
origin: "batch"
writer_model: "claude-sonnet-5"
date_created: "2026-07-25T00:00:00.000Z"
provenance: "batch web-research run, 2026-07-25, answering [[question-verify-blanke-2002-2014-primary-quotes]]"
derived_from: []
tags: ["neuroscience","hallucination","embodiment","angular-gyrus","out-of-body-experience","feeling-of-a-presence","source-verification","olaf-blanke"]
source_urls: ["https://philosophy.hku.hk/courses/cogsci/files/Blanke,%20Ortigue%20-%20Stimulating%20illusory%20own-body%20perceptions.pdf","https://pubmed.ncbi.nlm.nih.gov/25447995/","https://www.cell.com/current-biology/fulltext/S0960-9822(14)01212-3","https://www.researchgate.net/publication/268211377_Neurological_and_Robot-Controlled_Induction_of_an_Apparition","https://infoscience.epfl.ch/record/204032","https://actu.epfl.ch/news/neuroscientists-awaken-ghosts-hidden-in-our-cortex/"]
source_authors: ["Olaf Blanke, Stéphanie Ortigue, Theodor Landis, Margitta Seeck (2002 paper)","Olaf Blanke, Polona Pozeg, Masayuki Hara, Lukas Heydrich, Andrea Serino, et al. (2014 paper)","PubMed / NCBI (abstract-record host, verbatim reproduction of author abstract)","EPFL (actu.epfl.ch) — institution's own press office, direct Blanke quotes"]
source_dates: ["2002-09-19 (Nature 419:269–270)","2014-11-06 (Current Biology 24(22):2681–2686, online first)"]
source_tiers: ["Tier 1 — Blanke et al. 2002, Nature. Full primary text obtained directly (author's own peer-reviewed publication, verbatim page images transcribed).","Tier 1 — Blanke et al. 2014, Current Biology. Verbatim author-written abstract obtained via PubMed (abstract is part of the primary published paper, not a paraphrase); full body text NOT obtained (paywalled everywhere attempted).","Tier 1-2 — actu.epfl.ch press release. Institution's own venue, direct quotes attributed to Blanke, but this is a press gloss, not the paper itself — used only for a further-lead, not for verbatim confirmation."]
promoted_to: ["40-entities/entity-olaf-blanke.md — new person hub (from the ## Entity candidates section). The vault's central recurring researcher for this embodiment/hallucination cluster; owed a hub that predated this capture.","30-notes/claim-robot-induced-feeling-of-a-presence-models-patient-hallucination.md — no new note; the capture's one live finding (the body-quote discrepancy) folded into the existing note as an additive quote-provenance flag + dated body callout, note kept at seedling."]
not_promoted: ["'2002 Nature quote verified verbatim' — no new note. Confirms existing [[claim-angular-gyrus-stimulation-induced-out-of-body-experience]], already stamped verified_verbatim by seek_verify 2026-07-31 (mechanical, no model). The two extra details the capture confirms (right angular gyrus; single 43-year-old patient, reproducible) are already in that note. Duplicated verification.","'2014 Current Biology core quote verified verbatim (abstract-level)' — no new note. Confirms the frontmatter source_quote of existing [[claim-robot-induced-feeling-of-a-presence-models-patient-hallucination]], also already stamped verified_verbatim by seek_verify 2026-07-31.","EPFL press-release 'Blanke's own public gloss on the mechanism' (Further leads) — no note. Tier 1-2 press gloss that restates the already-confirmed mechanism in looser wording; would duplicate the two claims above. The capture itself declined to write it up for the same reason.","Entity candidates: Feeling of a presence (FoP), Out-of-body experience (OBE), Sensorimotor conflict — held, not promoted to concept hubs. Established terms adequately carried by their existing claim-notes (2–3 notes each), below a recurring/load-bearing threshold; bias against the entity flood. Only Blanke (person) cleared the bar.","Originating question [[question-verify-blanke-2002-2014-primary-quotes]] — already status: answered and archived in 50-questions/_answered/ (ruled by seek_verify 2026-07-31, which matched both notes' frontmatter source_quotes against direct fetches). Confirmed correctly answered; not reopened. The residual gap (2014 body quote + robotic-method specifics) is a narrower quote-accuracy caveat the bee's frontmatter-only match legitimately didn't cover — folded into the note flag above rather than routed as a new (blocked, non-load-bearing) question."]
---


Answers [[question-verify-blanke-2002-2014-primary-quotes]], which flagged that
[[claim-angular-gyrus-stimulation-induced-out-of-body-experience]] and
[[claim-robot-induced-feeling-of-a-presence-models-patient-hallucination]] had
been capture-verified only from PubMed abstract records, with the papers
themselves paywalled at capture time. This run attempted to obtain and diff
against the primary full texts.

## Claim: The 2002 Nature quote is verified verbatim against the full primary text

**Claim type:** Technical-mechanism / historical (single-patient finding). Floor: Tier 1–2 required.

A copy of the actual Nature "brief communications" page (Blanke, Ortigue,
Landis & Seeck, *Nature* 419:269–270, 19 September 2002) was located at a
university course-materials mirror and pulled via `extract_pdf`
(`tls: "verified"`, 2 pages, `pdftotext` extraction). The extracted text is a
line-for-line transcription of the published Nature page, including the
figure caption, author affiliations, and reference list — i.e., this is the
paper itself, not a summary. The sentence in question reads, verbatim:

> "Stimulation at this site also elicited illusory transformations of the patient's arm and legs (complex somatosensory responses) and whole-body displacements (vestibular responses), indicating that out-of-body experiences may reflect a failure by the brain to integrate complex somatosensory and vestibular information."

This is an **exact match** to the quote already recorded in
[[claim-angular-gyrus-stimulation-induced-out-of-body-experience]]. Two
further details from that claim-note are also confirmed against the primary
text: the stimulation site was specifically the **right angular gyrus** ("the
electrode site on the right angular gyrus where stimulation repeatedly
induced OBEs"), and induction was **reproducible within one patient** (a
43-year-old right-handed woman with 11 years of drug-resistant complex
partial seizures; the paper describes at least three separate stimulations
producing the OBE/vestibular/somatosensory cluster). This claim can be
upgraded from `capture-verified` to `verified-verbatim`.

**Sourcing:** Tier 1, full primary text read directly. Clears floor.

## Claim: The 2014 Current Biology core mechanism quote is verified verbatim against the paper's own abstract

**Claim type:** Technical-mechanism claim. Floor: Tier 1–2 required.

The 2014 paper's full body text could not be obtained in this session (see
"Further leads" for the paywall trail). However, PubMed's abstract record for
this paper reproduces the authors' own abstract in full — this is verbatim
primary-source text (the abstract is written by the authors and published as
part of the paper), not a third-party paraphrase. Fetched directly from
`https://pubmed.ncbi.nlm.nih.gov/25447995/`, the relevant sentence reads,
verbatim:

> "These data show that the illusion of feeling another person nearby is caused by misperceiving the source and identity of sensorimotor (tactile, proprioceptive, and motor) signals of one's own body."

This is an **exact match** (modulo the surrounding sentence structure) to the
quote recorded in
[[claim-robot-induced-feeling-of-a-presence-models-patient-hallucination]]:
"misperceiving the source and identity of sensorimotor (tactile,
proprioceptive, and motor) signals." This sub-claim can be upgraded to
`verified-verbatim (abstract-level)` — with the caveat that this confirms the
abstract's wording, not an independent re-check of the discussion section,
which remains inaccessible.

**Sourcing:** Tier 1 (author-written abstract, part of the primary published
paper). Clears floor for this specific sentence.

## Claim: The 2014 paper's "same experience... described by patients" quote and the robotic-method specifics could not be verified against primary full text

**Claim type:** Technical-mechanism / quote-accuracy claim. Floor: Tier 1–2 required.

Two elements of
[[claim-robot-induced-feeling-of-a-presence-models-patient-hallucination]]
remain unconfirmed against primary text after genuine effort this session:

1. The quote "the same experience spontaneously described by neurological
   and psychiatric patients" does **not** appear verbatim in the paper's
   abstract. The abstract's closest related sentence uses different wording:
   "Although it is described by neurological and psychiatric patients and
   healthy individuals in different situations, it is not yet understood how
   the phenomenon is triggered by the brain." The claim-note's quote may be
   drawn from the paper's introduction or discussion section, which was not
   reachable this session — `[unverified-quote — needs primary]`.
2. The claim-note's paraphrase of the method ("spatiotemporally mismatched
   tactile feedback... to their own back") is not directly contradicted by
   anything found, but was also not confirmed against primary text this
   session — the abstract only says the team "designed a master-slave
   robotic system that generated specific sensorimotor conflicts," without
   the back-placement or delay/displacement specifics. `[unverified-mechanism
   — needs primary]`.

Access attempts this session, all unsuccessful: `cell.com` fulltext and
direct PDF link (HTTP 403 on both `WebFetch` and `extract_pdf`),
ResearchGate publication page (HTTP 403 on `extract_pdf`), ScienceDirect
(paywalled), EPFL Infoscience institutional-repository mirrors — records
`204032` and handle `20.500.14299/109676`, both listed by Unpaywall as
open-access "submitted version" copies — returned HTTP 429 (rate-limited) on
five separate attempts across two different URLs, and Europe PMC / PMC have
no full-text record for this DOI. `web.archive.org` is not fetchable by the
tools available this session.

**Sourcing:** No Tier 1–2 source found for these two specific sub-claims in
this session. Recorded as gaps, not silently promoted.

## Overall verdict on the core question

Partially resolved. The two most load-bearing verbatim quotes underlying the
existing claim-notes — the 2002 Nature sentence about integration failure,
and the 2014 Current Biology sentence about "misperceiving the source and
identity of sensorimotor... signals" — are now **confirmed verbatim** against
Tier 1 primary text (full paper for 2002; author's own abstract for 2014).
The 2014 paper's body text (methods detail, and the "same experience...
described by patients" phrasing) remains **`[unverified — could not confirm
or deny after search]`** due to a genuinely paywalled/rate-limited primary
source, not for lack of trying. [[question-verify-blanke-2002-2014-primary-quotes]]
can be marked partially answered rather than closed.

## Further leads

- EPFL Infoscience holds open-access "submitted version" copies of the 2014
  paper at `infoscience.epfl.ch/record/204032` and
  `infoscience.epfl.ch/handle/20.500.14299/109676` (per Unpaywall) — repeatedly
  rate-limited (HTTP 429) this session; a retry in a later session, spaced
  out or via a different access path, would likely resolve the remaining gap.
- EPFL's own press release ("Neuroscientists awaken ghosts… hidden in our
  cortex," actu.epfl.ch) carries direct Blanke quotes on the mechanism in his
  own looser, non-paper phrasing (e.g., "the feeling of a presence... results
  from an alteration of 'sensorimotor' brain signals") — a Tier 1–2 lead for
  a distinct "Blanke's own public gloss on the mechanism" claim, not the same
  as the paper's text and not written up here to avoid duplicating the claims above.
- Unpaywall lists the 2014 paper as "Bronze" open access at cell.com itself —
  a reminder that an Unpaywall/OA listing does not guarantee the content is
  actually scrapeable; the publisher page 403'd on every direct fetch attempt.

## Entity candidates

- Olaf Blanke — person — senior/corresponding author on both papers spanning 2002–2014; EPFL/Geneva neuroscientist whose lab name (LNCO) recurs across this whole cluster of vault claims.
- Feeling of a presence (FoP) — concept — the clinical/experimental term at the center of the 2014 paper and the "Third Man Factor" popular framing already tracked elsewhere in the vault.
- Out-of-body experience (OBE) — concept — the 2002 paper's core phenomenon; could anchor a standalone definitional note distinct from the single-patient case claim.
- Sensorimotor conflict — concept — the shared mechanism-word across both the 2002 stimulation result and the 2014 robotic induction, worth a definitional note of its own.