Bodily sensation maps
A bodily sensation map (BSM) is the pixelwise topography of where in the body a person reports feeling activity increase and decrease during an emotion, measured with embody. The theoretical claim attached to them is stronger than the measure: that these maps are discrete, emotion-specific “fingerprints,” and that they determine the qualia of subjective emotional feeling (Nummenmaa et al. 2014, 2018).
That claim is a modern, high-resolution descendant of James — the felt body as the content of emotion — but relocated from physiology to phenomenology. See william-james, friedman-2010-jamesian-perspective.
The empirical profile
Volynets et al. (2020) is the largest test. In 3954 people across 101 countries:
- Each of 13 emotions plus neutral yielded a distinguishable map. Anger and happiness fill the upper body and head; sadness and depression are dominated by whole-body deactivation with limb “emptying”; love and pride concentrate in head, chest and (for love) genitals; shame and jealousy pair facial/chest activation with limb deactivation.
- The maps cluster by emotion, not by country (t-SNE), with inter-nation similarity rs > 0.82.
- Emotion category dominates the variance; culture, language, sex, education and BMI do not.
- Intensity dampens with age across all emotions (age-related-interoceptive-decline).
- Discreteness is not confined to Ekman’s six: anxiety, love, depression, contempt, pride, shame and jealousy have fingerprints too, which the authors read as universality extending past the canonical basic set.
The clinical profile — where the construct earns its keep
Lyons et al. (2021) add the first psychiatric data here, and a double dissociation that is better evidence for BSMs being about something real than any amount of cross-cultural concordance:
| are emotions distinguishable? | what changes | |
|---|---|---|
| schizophrenia (Torregrossa et al. 2018) | no — maps indistinguishable between emotions | the structure collapses |
| depression, unmedicated | yes — as accurate as controls | localised reductions (stomach, chest in sadness; legs in fear) |
| depression, medicated | yes — highest accuracy of the three groups | activation inverts to deactivation (63% of painted area vs 24% in controls) |
Two disorders, two different failures, one instrument. And a classifier trained on healthy controls transferred to both depressed groups above chance — depression does not relocate emotion in the body. Whatever is wrong with emotion in depression, sadness has not moved.
This matters for the word-cue objection below. If BSMs were simply shared conceptual knowledge about where emotions belong, they should not fracture along diagnostic lines — everyone in these samples knows the same folk theory of where sadness lives. See embody.
A problem for the constitutive claim
The strongest thing Nummenmaa’s group says about BSMs is not that they are discrete but that they determine the qualia of felt emotion. Two findings now put pressure on that, and both come from inside the paradigm.
Deactivation is induction-dependent. In Volynets et al., sadness and depression are carried primarily by deactivation — limb “emptying” is most of the signature. Under picture induction, “almost no deactivation reached significance” in healthy controls (lyons-2021-body-maps-depression), and the authors note the discrepancy without explaining it. If half the fingerprint appears or vanishes depending on whether you cue with a movie, a word, or a photograph, then the map is partly a property of the elicitation rather than of the emotion. A fingerprint that changes with the ink is a weak candidate for constituting qualia.
Sharp maps coexist with blunted feeling. Medicated patients reporting the felt bodily character of emotion as deactivation nonetheless classified at the highest rate in the study. The map stayed sharp and turned blue. If BSMs determined qualia, a large change in felt quality should have shown up as a change in map structure, not just its sign. See antidepressant-emotional-blunting.
Neither is fatal — a defender can say the maps track qualia faithfully and the qualia really did change sign — but both are places the constitutive claim (2) on lauri-nummenmaa has to do work it has not yet done.
Why the construct is contested
The interesting question is not whether BSMs are reproducible — they plainly are — but what they are maps of. Three readings are live in this wiki, and no source here adjudicates between them:
| reading | BSMs are… | fits |
|---|---|---|
| Nummenmaa’s | the felt output of emotion-specific bodily states; the substrate of qualia | basic-emotions, interoception |
| Constructionist | reports generated from shared concepts of emotion, cued by shared words | core-affect, lisa-feldman-barrett |
| Deflationary | a real and reliable phenomenological measure that simply has no physiological commitment either way | the authors’ own limitation section |
The third is the one the source itself endorses when pressed: “the BMs are thus subjective feeling maps.” That concession is easy to lose, because the discussion sections of these papers argue for a biological basis to emotion, while their limitations sections disclaim any physiological reading of the data. Both are in volynets-2020-cultural-universality.
Relation to autonomic specificity — a distinction to hold
BSM specificity and autonomic-specificity are separate claims and can come apart in either direction, which is worth stating explicitly because the vocabulary invites conflation (“fingerprints” is used in both literatures — compare Siegel et al. 2018, “Emotion fingerprints or emotion populations?”).
- Distinct felt maps without distinct autonomic patterns: what you would expect if felt maps are conceptually or attentionally organised. This is consistent with everything Volynets et al. report.
- Distinct autonomic patterns without distinct felt maps: what you would expect given imperfect interoceptive accuracy (Critchley et al. 2004).
So evidence for one is not evidence for the other. See autonomic-specificity-of-emotion, where BSM findings are recorded as re-describing rather than deciding the question.
Developmental arc
Two data points, one lifespan trajectory, both from this group: maps become more discrete across childhood into early adulthood (Hietanen et al. 2015), then weaken in intensity from adulthood to old age (Volynets et al. 2020). Sharpening then fading. Both legs are cross-sectional.
Note the shape of both the ageing and the depression results: what moves is intensity, not topography. Emotions are still felt in the same places, less strongly — in ageing, in depression, and on antidepressants alike. No source in this wiki reports a population whose maps are the same strength but a different shape, and only schizophrenia produces a loss of shape. Whether that is a fact about emotion or a ceiling of the instrument is untested. It also sets up is-more-interoceptive-awareness-better: if the only thing that varies is how loudly the body speaks, the interesting question is what the right volume is, and the wiki’s sources disagree.