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REVIEW 2 major objections 6 minor 170 references

Position: Olfaction Standardization is Essential for the Advancement of Embodied Artificial Intelligence

T0 review · 2 major / 6 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read This position paper argues that olfaction is missing from AI because of five structural, fixable gaps—no settled smell science, no data standard, no objective labels, scarce datasets, and no benchmarks—and that closing them should make…

desk verdict A well-cited, coherent agenda paper that deserves peer review; the main soft spot is the Section 2.1 claim that standardization can outpace scientific consensus, which the authors should defend more explicitly. read the letter →

arxiv 2506.00398 v1 pith:BUNTYH4V submitted 2025-05-31 cs.AI cs.RO

classification cs.AIcs.RO
keywords artificialolfactionembodiedAIolfactorydatastandardmachinebenchmarksdatasetsmultimodalperceptionneuromorphicethics
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that AI's neglect of the sense of smell is not a sign that smell is unimportant, but the result of five structural gaps that can be fixed. Those gaps are the absence of settled science on how odor perception works, the lack of a standard format for olfactory data, the difficulty of labeling signals that humans may not consciously detect, the scarcity of large datasets, and the absence of AI benchmarks for olfaction. The authors' position is that standardization can proceed in parallel with open scientific debates, just as image and audio formats were standardized without a complete model of perception. If they are right, closing these gaps would let machine olfaction grow at the pace vision and language did, and would make smell a core sensory input for embodied and multimodal AI. The paper's proposed first step is the creation of an olfactory data standard built from raw, digitized sensor recordings of molecular signatures, collected under controlled conditions and paired with consensus-based human annotations.

What carries the argument

The load-bearing mechanism is the proposed olfactory data standard, modeled on the way image and audio standards turned raw physical measurements into shared digital formats. Receptor arrays are treated as the analogue of pixels, signal intensity as the analogue of dynamic range, and the standard itself as the substrate that makes datasets from different labs compatible. Around that substrate the paper organizes its case into five named gaps—scientific understanding, data standard, objective annotation, datasets, and benchmarks—with the standard and benchmark suite doing the causal work of catalyzing progress. A supporting mechanism is the paper's bandwidth calculation, which ranks olfaction as a high-throughput sense and motivates event-based, neuromorphic processing for the sparse, intermittent plumes that carry odor stimuli in natural environments.

What would settle it

A concrete test: build the proposed standardized olfactory dataset from raw sensor recordings with calibrated molecular ground truth, train equivalent models on it and on today's ad hoc small datasets, and compare both on the same real-world scent-source localization task; if the standardized data yields no measurable advantage in accuracy or generalization, the claim that missing standards are the key bottleneck would be weakened.

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Extended reading notes

Core claim

The central claim is that the exclusion of olfaction from AI architectures is a correctable infrastructure failure rather than a sign of irrelevance. The paper asserts that objective progress can be made without first resolving the debate between shape-based and vibration-based theories of odor detection: raw, digitized sensor data capturing molecular signatures can serve as a common substrate, with human semantic labels added as layered, consensus-based annotations. It estimates human olfactory bandwidth above five kilobytes per second, placing smell third behind vision and hearing, and notes that canines likely exceed that by about twenty times, which makes superhuman machine olfaction a plausible engineering goal. The conclusion the paper draws is that a coordinated investment in standards, datasets, and benchmarks would let olfactory embeddings join visual and language embeddings in multimodal models, enabling embodied systems to locate odor sources, navigate by scent, and reason about scenes with chemical information.

Load-bearing premise

The argument rests on the premise that data standards, datasets, and benchmarks can be built and remain useful before the science of smell is settled; if the right way to represent odor turns out to depend on that unsettled science, early standards could encode a wrong abstraction and much of the proposed investment would be wasted.

Editorial extensions

If this is right

  • A shared olfactory data format would let research groups pool raw sensor recordings, ending the current fragmentation in which datasets from different labs cannot be compared or combined.
  • Benchmark suites modeled on large-scale vision and language evaluation templates would make machine smell measurable and attract research effort comparable to that given to other modalities.
  • Embodied systems could take on scent-based tasks such as gas-leak localization, plume tracking, food and crop quality assessment, breath-based diagnostics, and olfaction-visual reasoning in static and moving scenes.
  • Treating a person's odor profile as sensitive personal data would expand AI ethics beyond vision, language, and audio, requiring consent rules and auditing procedures for olfactory models.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • An editorial inference: the paper's own bandwidth arithmetic sets a concrete engineering target it does not name—a canine-level machine nose needs roughly twenty times human olfactory throughput, so sensor arrays and processors should be designed against that budget from the start.
  • An editorial inference: because odor signals arrive as short bursts separated by clean air, an event-based representation may fit olfaction better than fixed-frame recordings, and the standard should arguably be built around plume structure rather than continuous sampling.
  • An editorial inference: the paper identifies breath and body odor as future personal data but stops short of designing for it; a natural extension is that olfactory benchmarks should include consent, privacy, and audit protocols as first-class components from the outset.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 6 minor

Summary. This position paper argues that olfaction has been systematically neglected in AI research, not because it is irrelevant to embodied intelligence but because of five structural gaps: unresolved competing theories of olfactory coding (STO vs. VTO), heterogeneous sensor technologies and the absence of a data standard, the subjectivity of semantic labels, a lack of large-scale peer-reviewed datasets, and the absence of AI-oriented benchmarks. After reviewing bandwidth estimates and sensor properties, the paper proposes a parallel-progress model in which standardization and scientific understanding of olfaction develop together, and it sketches three classes of benchmark tasks (foundational perception, static-scene olfaction, dynamic-scene olfaction) plus ethical considerations. The central recommendation is a community-wide investment in olfactory data standards, datasets, and benchmarks comparable to those available for vision and language.

Significance. This is a timely and clearly written position piece that identifies a real gap in embodied AI research and proposes a concrete set of actions. If the main argument holds, it could help refocus community resources toward olfactory datasets, benchmarks, and standards, in the same way that earlier position pieces catalyzed investment in other modalities. The paper's strengths include: a literature-grounded enumeration of five structural gaps; a transparent first-order bandwidth model with explicit anatomical assumptions; reproducible publication-count queries with code and a stated limitation (Supplementary A); and a detailed taxonomy of benchmark tasks that goes beyond slogans. The central claim is not circular: the argument does not depend on the authors' own prior results, and self-citations appear only as supporting examples. The main weakness is the unexamined feasibility of standardizing olfaction before the receptor-coding question is resolved, which is the focus of the major comments below.

major comments (2)
  1. [Section 2.1 (parallel-progress claim); Section 2.4 (raw sensor data)] The paper's load-bearing premise — 'scientific progress and standardization process can move forward in parallel' — is not established by the analogies given. JPEG/PNG standardization did not require understanding the visual cortex, but it did presuppose a settled front-end physical representation: images are sampled spatially and trichromatically (RGB/YUV), a convention that was not in dispute. In olfaction, the analogous 'pixel' is exactly what is contested: Section 2.2 lists MOx, electrochemical, optical, acoustic, and carbon-nanotube sensors, and Sections 2.1 and 2.2 describe the unresolved STO/VTO debate. Aircraft airworthiness standards are functional safety criteria (e.g., margins, inspection intervals), not sensory-data representations; they do not address the risk that a standard encodes a wrong abstraction. The paper's own remedy in Section 2.4 (collecting 'raw, digitized sensor data') yields device-specific time series, not a modality-level standard, unless an additional theory-neutral layer (e.g., calibration metadata, transducer-agnostic event descriptors, and task-specific evaluation protocols) is specified. Without such a layer, the paper has not shown that a standard can be both built now and robust to the eventual resolution of the receptor-coding question. If the right representation depends on the STO/VTO outcome, datasets and benchmarks built on the wrong representation would partly waste the investment the paper calls for. The authors should either specify a theory-neutral standard layer or soften the claim to 'standardize multiple candidate representations in parallel,' which would change the title's assertion.
  2. [Section 2.4 (object of standardization)] The paper never defines what 'standard' it is calling for. Gap 2 in Section 1 lists both 'standardized data representation' and 'hardware specification,' while Section 2.4 recommends 'standardized protocols for sensor calibration, data acquisition, and comprehensive annotation' and Section 2.5 calls for benchmark tasks. These are different objects: a data format, a hardware interface, an annotation protocol, and an evaluation metric are not interchangeable, and a single 'olfactory data standard' cannot serve all of them simultaneously. In particular, the recommendation to collect 'raw, digitized sensor data' is a per-instrument convention, not a modality-level standard: raw MOx conductance values and raw optical spectra share no common vector space. The authors should specify which layer they propose to standardize (transducer output encoding, calibration metadata, task-level evaluation, or all three) and how that layer interacts with the unresolved representation question raised in Section 2.1. Without this specification, the central call to action is ambiguous and difficult to evaluate.
minor comments (6)
  1. [Section 2.2 (bandwidth)] The bandwidth calculation does not match the stated assumptions. With 400 ORN types, 2 glomeruli each, 25 mitral cells per glomerulus, 4 bits per cell, and 1 Hz sniffing, the rate is 400 × 2 × 25 × 4 = 80,000 bit/s = 10 kB/s, not '>5 kB/s' as printed. Use the correct value or revise the assumptions; the qualitative claim that olfaction is a high-bandwidth channel is unaffected.
  2. [Figure 1 and Section A (publication counts)] The publication-count comparison is not apples-to-apples: olfaction is counted by title keywords, while the comparator fields are counted by arXiv category. This likely undercounts olfaction (e.g., papers using 'electronic nose' or 'gas sensor array' without the listed keywords). State in the caption and text that the reported ratios are lower bounds, not precise measurements.
  3. [Section 3 (OVLM citations)] The claim that 'Emerging olfaction-vision-language models (OVLMs)' are exemplified by references [61,133] relies on a commercial mobile application rather than a peer-reviewed model; replace these citations with a scholarly reference or rephrase as 'early commercial demonstrations.'
  4. [Section 2.1 (Turin citation)] The text says 'Luca Turin re-popularized the idea in 2001' but the cited reference [145] is a 2015 PNAS correspondence; add the original 1996 Nature paper or a 2001 source to support the date.
  5. [Section 2.2 (encoding paragraph)] The paragraph on encoding claims olfaction 'forms a discrete space' and later emphasizes 'episodic, rather than continuous, sampling'; these two notions (discrete molecular-space encoding vs. temporal sparsity) should be explicitly separated, because a standard must handle both dimensions.
  6. [Throughout (typos)] Fix inconsistent spacing in 'W A V', 'A VI', 'V on Neumann', and 'ArXiV' (Sections 1 and 2.2, Figure 1).

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper is a position argument whose load-bearing premises are supported by external, independently reproducible literature and its own first-order estimates, not by fitted values or self-citation chains.

full rationale

This is a position paper, not an empirical derivation, so the standard circularity patterns (fitted inputs renamed as predictions, self-referential uniqueness theorems, ansatz smuggled via citation) do not apply. The central claim is that olfaction is neglected in AI because of five structural challenges and that standardization, datasets, and benchmarks would advance embodied AI. Each supporting step is grounded in external literature: the unresolved STO/VTO debate cites Dyson, Turin, Block, and others; the sensor heterogeneity discussion cites multiple independent sensor-technology sources; the publication-disparity figure is a reproducible bibliometric query; and the olfactory bandwidth estimate is an explicit first-order calculation from cited neurobiological parameters (sniff rate, receptor counts, mitral-cell counts, spike rates), not an input assumed from the conclusion. Self-citations appear only as illustrative supporting examples (e.g., a high-speed electronic nose, dataset limitations, procedural-activity datasets, and an olfaction-vision-language app) and are not load-bearing: the argument would stand unchanged if those citations were removed. The weakest point, flagged by the skeptical reader, is the Section 2.1 analogy that scientific progress and standardization can proceed in parallel despite unresolved olfactory theory, but that is a substantive argumentative weakness about whether the proposed standard could encode a wrong abstraction; it is not circularity by construction or by self-citation. Under the hard rules, no specific reduction of a claimed result to its own inputs can be exhibited, so the appropriate score is 0.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

No free parameters are fitted; the central position is an argument, not a model. The bandwidth estimate takes physiological inputs from cited literature plus a 4-bit encoding choice, none tuned to force a target result. The axioms are the domain assumptions that make the position's evidence load-bearing.

assumptions (4)
  • domain assumption Standardization of olfactory data can proceed in parallel with unresolved scientific theories of smell.
    Section 2.1 asserts the JPEG and aircraft analogies; the entire call for early benchmark construction depends on this premise.
  • domain assumption Human olfactory bandwidth can be estimated from anatomical counts (400 ORN types, 2 glomeruli each, 25 mitral cells per glomerulus, 0-13 spikes) and yields the third-highest sensory throughput.
    Section 2.2, the bandwidth paragraph, uses this to claim olfaction's importance in the hierarchy of senses.
  • domain assumption Olfactory coding is discrete and combinatorial rather than continuous, so it needs a different data standard than images or audio.
    Section 2.2, encoding paragraph, cites refs on combinatorial receptor codes and sparse activation; the case for a bespoke standard rests on this.
  • domain assumption Relative neglect of olfaction is measurable by title-only searches of arXiv and Semantic Scholar categories.
    Supplementary A; the 'less than 1%' claim depends on this search strategy, which may miss sensor-science and chemistry venues.

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Cite this review

Pith. "Pith review of Position: Olfaction Standardization is Essential for the Advancement of Embodied Artificial Intelligence." pith.science (2026). https://pith.science/paper/BUNTYH4V

@misc{pith2026250600398,
  author       = {Pith},
  title        = {Pith review of: Position: Olfaction Standardization is Essential for the Advancement of Embodied Artificial Intelligence},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/BUNTYH4V}},
  note         = {Machine review of arXiv:2506.00398}
}
read the original abstract

Despite extraordinary progress in artificial intelligence (AI), modern systems remain incomplete representations of human cognition. Vision, audition, and language have received disproportionate attention due to well-defined benchmarks, standardized datasets, and consensus-driven scientific foundations. In contrast, olfaction - a high-bandwidth, evolutionarily critical sense - has been largely overlooked. This omission presents a foundational gap in the construction of truly embodied and ethically aligned super-human intelligence. We argue that the exclusion of olfactory perception from AI architectures is not due to irrelevance but to structural challenges: unresolved scientific theories of smell, heterogeneous sensor technologies, lack of standardized olfactory datasets, absence of AI-oriented benchmarks, and difficulty in evaluating sub-perceptual signal processing. These obstacles have hindered the development of machine olfaction despite its tight coupling with memory, emotion, and contextual reasoning in biological systems. In this position paper, we assert that meaningful progress toward general and embodied intelligence requires serious investment in olfactory research by the AI community. We call for cross-disciplinary collaboration - spanning neuroscience, robotics, machine learning, and ethics - to formalize olfactory benchmarks, develop multimodal datasets, and define the sensory capabilities necessary for machines to understand, navigate, and act within human environments. Recognizing olfaction as a core modality is essential not only for scientific completeness, but for building AI systems that are ethically grounded in the full scope of the human experience.

Figures

Figures reproduced from arXiv: 2506.00398 by the authors.

Figure 1
Figure 1. The number of publications from ArXiV [39] and Semantic Scholar [88] over the period 1 January 2015 to 1 May 2025 in computer vision (CV), natural language processing (NLP), computer audio (CA), and artificial olfaction (AO). (a) illustrates the total number of publications in each category as retrieved from the ArXiv and Semantic Scholar databases. (b) shows the temporal trend in published research for each categor… view at source ↗
Figure 2
Figure 2. Analogy of olfaction to computer vision. [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Illustrates how standardized olfactory data and models can integrate with other modalities [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: An example of perception versus precision in olfaction. The solid orange curve indicates [PITH_FULL_IMAGE:figures/full_fig_p022_4.png]

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