Evidence map›Paper›PMID 34983837›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2022

Sector search strategies for odor trail tracking.

Gautam Reddy, Boris I Shraiman, Massimo Vergassola

Open access · hybridAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
7.3field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed, 24 citations in OpenAlex.

  1. Review
  2. Learning spatial hearing via innate mechanisms.PLoS computational biology · 2025
    Article
  3. Article
  4. Mice navigate scent trails using predictive policies.bioRxiv : the preprint server for biology · 2025
    Article
  5. Article
  6. Article
  7. Design Principles From Natural Olfaction for Electronic Noses.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025
    Review
  8. Article
  9. Article
  10. Article
  11. Article
  12. Adaptive algorithms for shaping behavior.bioRxiv : the preprint server for biology · 2023
    Article
  13. A dynamical model ofProceedings of the National Academy of Sciences of the United States of America · 2023
    Article
  14. Article
  15. Article
  16. Olfactory Sensing and Navigation in Turbulent Environments.Annual review of condensed matter physics · 2022
    Article
  17. A new angle on odor trail tracking.Proceedings of the National Academy of Sciences of the United States of America · 2022
    Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 2 countries.

Gautam ReddyNSF-Simons Center for Mathematical & Statistical Analysis of Biology, Harvard University, Cambridge, MA 02138.ORCID 0000-0002-1276-9613
Boris I ShraimanKavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106; shraiman@ucsb.edu massimo.vergassola@phys.ens.fr.
Massimo VergassolaDepartment of Physics, University of California San Diego, La Jolla, CA 92093; shraiman@ucsb.edu massimo.vergassola@phys.ens.fr.
Centre National de la Recherche Scientifique · FRUniversity of California San Diego · USUniversity of California, Santa Barbara · US

Funding

Odor trail tracking: a new paradigm to unveil algorithms and neural circuits underlying active sensation and continuous decision makingRF1NS128865 · NINDS · HARVARD UNIVERSITY · PI DULAC, CATHERINE, MURTHY, VENKATESH N · 2022 to 2022
$2.7M
KITP Interdisciplinary Biology InitiativeR25GM067110 · NIGMS · UNIVERSITY OF CALIFORNIA SANTA BARBARA · PI SHRAIMAN, BORIS I · 2003 to 2018
$1.8M
NIGMS NIH HHS R25 GM067110NINDS NIH HHS RF1 NS128865
6 · The paper itself

Abstract

Ants, mice, and dogs often use surface-bound scent trails to establish navigation routes or to find food and mates, yet their tracking strategies remain poorly understood. Chemotaxis-based strategies cannot explain casting, a characteristic sequence of wide oscillations with increasing amplitude performed upon sustained loss of contact with the trail. We propose that tracking animals have an intrinsic, geometric notion of continuity, allowing them to exploit past contacts with the trail to form an estimate of where it is headed. This estimate and its uncertainty form an angular sector, and the emergent search patterns resemble a "sector search." Reinforcement learning agents trained to execute a sector search recapitulate the various phases of experimentally observed tracking behavior. We use ideas from polymer physics to formulate a statistical description of trails and show that search geometry imposes basic limits on how quickly animals can track trails. By formulating trail tracking as a Bellman-type sequential optimization problem, we quantify the geometric elements of optimal sector search strategy, effectively explaining why and when casting is necessary. We propose a set of experiments to infer how tracking animals acquire, integrate, and respond to past information on the tracked trail. More generally, we define navigational strategies relevant for animals and biomimetic robots and formulate trail tracking as a behavioral paradigm for learning, memory, and planning.

Indexed as

OdorantsAlgorithmsAnimalsAntsBehavior, AnimalChemotaxisDogsFeeding BehaviorFoodLearningMemoryMiceModels, BiologicalPheromonesPheromonesalgorithmbehavioroptimizationstracking

Identifiers

PMID34983837
PMCPMC8740577
OpenAlexW4206217072

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.