The coordination of movement: optimal feedback control and beyond
Open accessAbstract
Optimal control theory and its more recent extension, optimal feedback control theory, provide valuable insights into the flexible and task-dependent control of movements. Here, we focus on the problem of coordination, defined as movements that involve multiple effectors (muscles, joints or limbs). Optimal control theory makes quantitative predictions concerning the distribution of work across multiple effectors. Optimal feedback control theory further predicts variation in feedback control with changes in task demands and the correlation structure between different effectors. We highlight two crucial areas of research, hierarchical control and the problem of movement initiation, that need to be developed for an optimal feedback control theory framework to characterise movement coordination more fully and to serve as a basis for studying the neural mechanisms involved in voluntary motor control.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the context of optimal feedback control, structured variability is thought to result from regularizations of the cost functions associated with movement generation, such as minimization of jerk or energy expenditure.
“In the context of optimal feedback control, such ‘structured variability’ is thought to result from regularizations of the cost functions associated with movement generation 52, such as the minimization of jerk 53 or energy expenditure.”
From A virtual rodent predicts the structure of neural activity across behaviours (2024) · cites this paper as [52]
Animals structure movement variability differently depending on the task, with variability preferentially quenched along task-relevant dimensions in accordance with the minimal intervention principle.
“It has been widely observed that animals structure movement variability differently depending on the task, with variability preferentially quenched along task-relevant dimensions in accordance with the minimal intervention principle 7,51,52.”
From A virtual rodent predicts the structure of neural activity across behaviours (2024) · cites this paper as [52]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
The co-ordination and regulation of movements
Bernshteĭn, N. A. (1967) · Brain Research · doi:10.1016/0006-8993(69)90278-9 · Cited by 6,389 · see citing works
Humans integrate visual and haptic information in a statistically optimal fashion
Ernst, M. O., & Banks, M. S. (2002) · Nature · doi:10.1038/415429a · Cited by 4,844 · see citing works
The coordination of arm movements: an experimentally confirmed mathematical model
Flash, T., & Hogan, N. (1985) · The Journal of Neuroscience · doi:10.1523/jneurosci.05-07-01688.1985 · Cited by 4,395 · see citing works
Optimal feedback control as a theory of motor coordination
Todorov, E., & Jordan, M. I. (2002) · Nature Neuroscience · doi:10.1038/nn963 · Cited by 3,081 · see citing works
Muscle and tendon: properties, models, scaling, and application to biomechanics and motor control.
Zajac, F. E. (1989) · PubMed · Cited by 2,980 · see citing works
Dynamic patterns: The self-organization of brain and behavior
(1997) · Computers & Mathematics with Applications · doi:10.1016/s0898-1221(97)90151-6 · Cited by 2,857 · see citing works
Signal-dependent noise determines motor planning
Harris, C. M., & Wolpert, D. M. (1998) · Nature · doi:10.1038/29528 · Cited by 2,498 · see citing works
Formation and control of optimal trajectory in human multijoint arm movement
Yasuo, U. N. O., Kawato, M., & Suzuki, R. (1989) · Biological Cybernetics · doi:10.1007/bf00204593 · Cited by 1,718 · see citing works
Phase transitions and critical behavior in human bimanual coordination
Kelso, J. A. S. (1984) · American Journal of Physiology-Regulatory, Integrative and Comparative Physiology · doi:10.1152/ajpregu.1984.246.6.r1000 · Cited by 1,516 · see citing works
The uncontrolled manifold concept: identifying control variables for a functional task
Scholz, J. P., & Schöner, G. (1999) · Experimental Brain Research · doi:10.1007/s002210050738 · Cited by 1,472 · see citing works
Combinations of muscle synergies in the construction of a natural motor behavior
d’Avella, A., Saltiel, P., & Bizzi, E. (2003) · Nature Neuroscience · doi:10.1038/nn1010 · Cited by 1,348 · see citing works
Cognitive control, hierarchy, and the rostro–caudal organization of the frontal lobes
Badre, D. (2008) · Trends in Cognitive Sciences · doi:10.1016/j.tics.2008.02.004 · Cited by 980 · see citing works
Motor Control Strategies Revealed in the Structure of Motor Variability
Latash, M. L., Scholz, J. P., & Sch??ner, G. (2002) · Exercise and Sport Sciences Reviews · doi:10.1097/00003677-200201000-00006 · Cited by 822 · see citing works
Bullock, D. H., & Grossberg, S. (1988) · Psychological Review · doi:10.1037/0033-295x.95.1.49 · Cited by 810 · see citing works
Intermanual coordination: From behavioural principles to neural-network interactions
Swinnen, S. P. (2002) · Nature reviews. Neuroscience · doi:10.1038/nrn807 · Cited by 791 · see citing works
Control of Fast-Reaching Movements by Muscle Synergy Combinations
d’Avella, A., Portone, A., Fernandez, L., & Lacquaniti, F. (2006) · Journal of Neuroscience · doi:10.1523/jneurosci.0830-06.2006 · Cited by 727 · see citing works
Shared and specific muscle synergies in natural motor behaviors
d’Avella, A., & Bizzi, E. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0500199102 · Cited by 708 · see citing works
A Limited Set of Muscle Synergies for Force Control During a Postural Task
Ting, L. H., & Macpherson, J. M. (2004) · Journal of Neurophysiology · doi:10.1152/jn.00681.2004 · Cited by 696 · see citing works
Perceptual basis of bimanual coordination
Mechsner, F., Kerzel, D., Knoblich, G., & Prinz, W. (2001) · Nature · doi:10.1038/35102060 · Cited by 657 · see citing works
Dynamic Movement Primitives -A Framework for Motor Control in Humans and Humanoid Robotics
Schaal, S. (2006) · Springer eBooks · doi:10.1007/4-431-31381-8_23 · Cited by 620 · see citing works
The construction of movement by the spinal cord
Tresch, M. C., Saltiel, P., & Bizzi, E. (1999) · Nature Neuroscience · doi:10.1038/5721 · Cited by 620 · see citing works
Cerebellar ataxia: abnormal control of interaction torques across multiple joints.
Bastian, A. J., Martin, T. A., Keating, J. G., & Thach, W. (1996) · Journal of Neurophysiology · doi:10.1152/jn.1996.76.1.492 · Cited by 608 · see citing works
On the coordination of two-handed movements.
Kelso, J. S., Southard, D. L., & Goodman, D. (1979) · Journal of Experimental Psychology Human Perception & Performance · doi:10.1037//0096-1523.5.2.229 · Cited by 597 · see citing works
Effort-Based Cost–Benefit Valuation and the Human Brain
Croxson, P. L., Walton, M. E., O'Reilly, J. X., Behrens, T. E. J., & Rushworth, M. F. S. (2009) · The Journal of Neuroscience · doi:10.1523/jneurosci.4515-08.2009 · Cited by 560 · see citing works
Evidence for the Flexible Sensorimotor Strategies Predicted by Optimal Feedback Control
Liu, D., & Todorov, E. (2007) · The Journal of Neuroscience · doi:10.1523/jneurosci.1110-06.2007 · Cited by 447 · see citing works
On the coordination of two-handed movements.
Kelso, J. A. S., Southard, D. L., & Goodman, D. M. (1979) · Journal of Experimental Psychology Human Perception & Performance · doi:10.1037/0096-1523.5.2.229 · Cited by 433 · see citing works
Todorov, E. V. (2005) · Neural Computation · doi:10.1162/0899766053491887 · Cited by 400 · see citing works
Models of Trajectory Formation and Temporal Interaction of Reach and Grasp.
Hoff, B., & Arbib, M. (1993) · Journal of Motor Behavior · doi:10.1080/00222895.1993.9942048 · Cited by 379 · see citing works
Motor Adaptation as a Process of Reoptimization
Izawa, J., Rane, T. D., Donchin, O., & Shadmehr, R. (2008) · Journal of Neuroscience · doi:10.1523/jneurosci.5359-07.2008 · Cited by 341 · see citing works
Self-citationBimanual Movement Control: Information processing and Interaction Effects
Marteniuk, R. G., MacKenzie, C. L., & Baba, D. M. (1984) · The Quarterly Journal of Experimental Psychology Section A · doi:10.1080/14640748408402163 · Cited by 334 · see citing works
Long-latency reflexes of the human arm reflect an internal model of limb dynamics.
Kurtzer, I. L., Pruszynski, J., & Scott, S. (2008) · Current Biology · doi:10.1016/j.cub.2008.02.053 · Cited by 285 · see citing works
Spatial topological constraints in a bimanual task
Franz, E. A., Zelaznik, H. N., & McCabe, G. P. (1991) · Acta Psychologica · doi:10.1016/0001-6918(91)90028-x · Cited by 253 · see citing works
Kinematic networks: A distributed model for representing and regularizing motor redundancy
Ivaldi, F. A. M., Morasso, P., & Zaccaria, R. (1988) · Biological Cybernetics · doi:10.1007/bf00205967 · Cited by 251 · see citing works
Spatial generalization from learning dynamics of reaching movements
Shadmehr, R., & Moussavi, Z. M. K. (2000) · The Journal of Neuroscience · doi:10.1523/jneurosci.20-20-07807.2000 · Cited by 249 · see citing works
Self-citationOptimal Task-Dependent Changes of Bimanual Feedback Control and Adaptation
Diedrichsen, J. (2007) · Current Biology · doi:10.1016/j.cub.2007.08.051 · Cited by 238 · see citing works
Self-citationRapid Motor Responses Are Appropriately Tuned to the Metrics of a Visuospatial Task
Pruszynski, J. A., Kurtzer, I. L., & Scott, S. H. (2008) · Journal of Neurophysiology · doi:10.1152/jn.90262.2008 · Cited by 230 · see citing works
Callosotomy patients exhibit temporal uncoupling during continuous bimanual movements
Kennerley, S., Diedrichsen, J., Hazeltine, E., Semjén, A., & Ivry, R. (2002) · Nature Neuroscience · doi:10.1038/nn822 · Cited by 225 · see citing works
Self-citationMARSDEN, C. D., Merton, P. A., & Morton, H. (1981) · Brain · doi:10.1093/brain/104.3.513 · Cited by 218 · see citing works
Valero-Cuevas, F. J., Venkadesan, M., & Todorov, E. (2009) · Journal of Neurophysiology · doi:10.1152/jn.90324.2008 · Cited by 218 · see citing works
Structure of joint variability in bimanual pointing tasks
Domkin, D., Laczkó, J., Jarić, S., Johansson, H., & Latash, M. L. (2001) · Experimental Brain Research · doi:10.1007/s00221-001-0944-1 · Cited by 193 · see citing works
Modulation of Muscle Synergy Recruitment in Primate Grasping
Overduin, S. A., d’Avella, A., Roh, J., & Bizzi, E. (2008) · Journal of Neuroscience · doi:10.1523/jneurosci.2869-07.2008 · Cited by 190 · see citing works
Coordinated responses following mechanical perturbation of the arm during prehension
Haggard, P., & Wing, A. M. (1995) · Experimental Brain Research · doi:10.1007/bf00230652 · Cited by 160 · see citing works
Karst, G. M., & Hasan, Z. (1991) · Journal of Neurophysiology · doi:10.1152/jn.1991.66.5.1594 · Cited by 159 · see citing works
Vaziri, S., Diedrichsen, J., & Shadmehr, R. (2006) · Journal of Neuroscience · doi:10.1523/jneurosci.4747-05.2006 · Cited by 157 · see citing works
Self-citationMoving to Directly Cued Locations Abolishes Spatial Interference During Bimanual Actions
Diedrichsen, J., Hazeltine, E., Kennerley, S. W., & Ivry, R. B. (2001) · Psychological Science · doi:10.1111/1467-9280.00391 · Cited by 146 · see citing works
Self-citationEndpoint Force Fluctuations Reveal Flexible Rather Than Synergistic Patterns of Muscle Cooperation
Kutch, J. J., Kuo, A. D., Bloch, A. M., & Rymer, W. Z. (2008) · Journal of Neurophysiology · doi:10.1152/jn.90274.2008 · Cited by 137 · see citing works
Variability and Noise in Continuous Force Production
Slifkin, A. B., & Newell, K. M. (2000) · Journal of Motor Behavior · doi:10.1080/00222890009601366 · Cited by 130 · see citing works
Dissociating timing and coordination as functions of the cerebellum
Diedrichsen, J., Criscimagna-Hemminger, S. E., & Shadmehr, R. (2007) · Journal of Neuroscience · doi:10.1523/jneurosci.0061-07.2007 · Cited by 127 · see citing works
Self-citationSzentesi, P., Zaremba, R., van Mechelen, W., & Stienen, G. J. M. (2001) · The Journal of Physiology · doi:10.1111/j.1469-7793.2001.0393i.x · Cited by 124 · see citing works
Structural constraints on bimanual movements
Heuer, H. (1993) · Psychological Research · doi:10.1007/bf00419639 · Cited by 121 · see citing works
Hoffman, D. S., & Strick, P. L. (1999) · Journal of Neurophysiology · doi:10.1152/jn.1999.81.1.319 · Cited by 121 · see citing works
Dissociating Variability and Effort as Determinants of Coordination
O'Sullivan, I., Burdet, E., & Diedrichsen, J. (2009) · PLoS Computational Biology · doi:10.1371/journal.pcbi.1000345 · Cited by 117 · see citing works
Self-citationAdaptive Motion of Animals and Machines
Kimura, H., Witte, H., Tsuchiya, K., et al. (2006) · doi:10.1007/4-431-31381-8 · Cited by 117 · see citing works
Cosine Tuning Minimizes Motor Errors
Todorov, E. V. (2002) · Neural Computation · doi:10.1162/089976602753712918 · Cited by 109 · see citing works
Independent on‐line control of the two hands during bimanual reaching
Diedrichsen, J., Nambisan, R., Kennerley, S., & Ivry, R. (2004) · European Journal of Neuroscience · doi:10.1111/j.1460-9568.2004.03242.x · Cited by 104 · see citing works
Self-citationA comparison of models explaining muscle activation patterns for isometric contractions
van Bolhuis, B. M., & Gielen, C. C. A. M. (1999) · Biological Cybernetics · doi:10.1007/s004220050560 · Cited by 101 · see citing works
A Computational Model of Muscle Recruitment for Wrist Movements
Fagg, A. H., Shah, A., & Barto, A. G. (2002) · Journal of Neurophysiology · doi:10.1152/jn.00621.2002 · Cited by 95 · see citing works
A Cognitive Neuroscience Perspective on Bimanual Coordination and Interference
Ivry, R., Diedrichsen, J., Spencer, R., Hazeltine, E., & Semjén, A. (2004) · Springer eBooks · doi:10.1007/978-1-4419-9056-3_10 · Cited by 91 · see citing works
Self-citationPostural changes accompanying voluntary movements. Normal and pathological aspects.
Massion, J. (1984) · PubMed · Cited by 87 · see citing works
The Role of the Corpus Callosum in the Coupling of Bimanual Isometric Force Pulses
Diedrichsen, J., Hazeltine, E., Nurss, W. K., & Ivry, R. B. (2003) · Journal of Neurophysiology · doi:10.1152/jn.00250.2003 · Cited by 86 · see citing works
Self-citationKarniel, A., & Mussa-Ivaldi, F. A. (2003) · Biological Cybernetics · doi:10.1007/s00422-003-0397-7 · Cited by 75 · see citing works
Timing of finger opening and ball release in fast and accurate overarm throws
Hore, J., Watts, S., Martin, J. H., et al. (1995) · Experimental Brain Research · doi:10.1007/bf00231714 · Cited by 73 · see citing works
Shared Bimanual Tasks Elicit Bimanual Reflexes During Movement
Mutha, P. K., & Sainburg, R. L. (2009) · Journal of Neurophysiology · doi:10.1152/jn.91335.2008 · Cited by 67 · see citing works
Properties of Synergies Arising from a Theory of Optimal Motor Behavior
Chhabra, M., & Jacobs, R. A. (2006) · Neural Computation · doi:10.1162/neco.2006.18.10.2320 · Cited by 67 · see citing works
Progress in Motor Control: Bernstein's Traditions in Movement Studies
Bunker, L. (1999) · Europe PMC (PubMed Central) · Cited by 65 · see citing works
Time structure of a goal-directed bimanual skill and its dependence on task constraints
Perrig, S. H., Kazennikov, O. V., & Wiesendanger, M. (1999) · Behavioural Brain Research · doi:10.1016/s0166-4328(99)00026-1 · Cited by 60 · see citing works
Flexible Representations of Dynamics Are Used in Object Manipulation
Ahmed, A. A., Wolpert, D. M., & Flanagan, J. R. (2008) · Current Biology · doi:10.1016/j.cub.2008.04.061 · Cited by 56 · see citing works
Subcortical locus of temporal coupling in the bimanual movements of a callosotomy patient
Ivry, R. B., & Hazeltine, E. (1999) · Human Movement Science · doi:10.1016/s0167-9457(99)00014-7 · Cited by 55 · see citing works
Self-citationNozaki, D., Nakazawa, K., & Akai, M. (2005) · Journal of Neurophysiology · doi:10.1152/jn.00960.2004 · Cited by 50 · see citing works
Bimanual coordination as task-dependent linear control policies
Diedrichsen, J., & Dowling, N. (2009) · Human Movement Science · doi:10.1016/j.humov.2008.10.003 · Cited by 40 · see citing works
Self-citationComposition and Decomposition in Bimanual Dynamic Learning
Howard, I. S., Ingram, J. N., & Wolpert, D. M. (2008) · Journal of Neuroscience · doi:10.1523/jneurosci.3473-08.2008 · Cited by 38 · see citing works
Simultaneous bimanual dynamics are learned without interference
Tcheang, L., Bays, P. M., Ingram, J. N., et al. (2007) · Experimental Brain Research · doi:10.1007/s00221-007-1016-y · Cited by 37 · see citing works
Sternad, D., Wei, K., Diedrichsen, J., & Ivry, R. B. (2006) · Experimental Brain Research · doi:10.1007/s00221-006-0640-2 · Cited by 37 · see citing works
Self-citationHore, J., Ritchie, R., & Watts, S. (1999) · Experimental Brain Research · doi:10.1007/s002210050686 · Cited by 35 · see citing works
Timing Finger Opening in Overarm Throwing Based on a Spatial Representation of Hand Path
Hore, J., & Watts, S. (2005) · Journal of Neurophysiology · doi:10.1152/jn.01268.2004 · Cited by 33 · see citing works
Hierarchical optimal control of redundant biomechanical systems
Li, W., Todorov, E. V., & Pan, X. (2005) · Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) · doi:10.1109/iembs.2004.1404280 · Cited by 30 · see citing works
Reversal of Bimanual Feedback Responses With Changes in Task Goal
Diedrichsen, J., & Gush, S. (2008) · Journal of Neurophysiology · doi:10.1152/jn.90887.2008 · Cited by 24 · see citing works
Self-citationHierarchical Feedback and Learning for Multi-joint Arm Movement Control
Li, W., Todorov, E., & Pan, X. (2005) · doi:10.1109/iembs.2005.1615441 · Cited by 10 · see citing works
Haggard, P. (1997) · The Quarterly Journal of Experimental Psychology Section A · doi:10.1080/713755728 · Cited by 3 · see citing works
Flagged first, then by citations
Research works printed but not linked: 1
- [56]Saltzman EL Port RF Van Gelder T Dynamics and coordinate systems in skilled senorimotor activity Mind As Motion: Explorations in the Dynamics of Cognition 1979 MIT Press 149 172
Cited by
Sorted by citations
Computational neuroanatomy of speech production
Hickok, G. (2012) · Nature Reviews Neuroscience · doi:10.1038/nrn3158 · Cited by 837 · see citing works
Human sensorimotor learning: adaptation, skill, and beyond
Krakauer, J. W., & Mazzoni, P. (2011) · Current Opinion in Neurobiology · doi:10.1016/j.conb.2011.06.012 · Cited by 558 · see citing works
Cognitive computational neuroscience
Kriegeskorte, N., & Douglas, P. K. (2018) · Nature Neuroscience · doi:10.1038/s41593-018-0210-5 · Cited by 535 · see citing works
The Frontoparietal Control System: A Central Role in Mental Health
Cole, M. W., Repovš, G., & Anticevic, A. (2014) · The Neuroscientist · doi:10.1177/1073858414525995 · Cited by 461 · see citing works
D'Angelo, E., & Casali, S. (2013) · Frontiers in Neural Circuits · doi:10.3389/fncir.2012.00116 · Cited by 407 · see citing works
Dopamine, affordance and active inference
Friston, K. J., Shiner, T., FitzGerald, T., Galea, J. M., Adams, R., Brown, H., Dolan, R. J., Moran, R., Stephan, K. E., & Bestmann, S. (2012) · PLoS Computational Biology · doi:10.1371/journal.pcbi.1002327 · Cited by 381 · see citing works
What is optimal about motor control?
Friston, K. (2011) · Neuron · doi:10.1016/j.neuron.2011.10.018 · Cited by 332 · see citing works
Hierarchical motor control in mammals and machines
Merel, J., Botvinick, M., & Wayne, G. (2019) · Nature Communications · doi:10.1038/s41467-019-13239-6 · Cited by 274 · see citing works
Modeling the Role of Sensory Feedback in Speech Motor Control and Learning
Parrell, B., & Houde, J. (2019) · Journal of Speech, Language, and Hearing Research · doi:10.1044/2019_jslhr-s-csmc7-18-0127 · Cited by 75 · see citing works
A virtual rodent predicts the structure of neural activity across behaviours
Aldarondo, D., Merel, J., Marshall, J. D., Hasenclever, L., Klibaite, U., Gellis, A., Tassa, Y., Wayne, G., Botvinick, M., & Ölveczky, B. P. (2024) · Nature · doi:10.1038/s41586-024-07633-4 · Cited by 70 · see citing works
Quickly “learning” to move optimally
Brenner, E., & Smeets, J. B. J. (2011) · Experimental Brain Research · doi:10.1007/s00221-011-2786-9 · Cited by 32 · see citing works
- Authors
- Diedrichsen, J., Shadmehr, R., & Ivry, R. B.
- Affiliations
- Bangor University (GB)
- Johns Hopkins University (US)
- University of California, Berkeley (US)
- Corresponding author
- Diedrichsen, Jörn
- Venue
- Trends in Cognitive Sciences
- Publisher
- Elsevier BV
- Published
- 2010-01
- Volume
- 14
- Issue
- 1
- Pages
- 31-39
- ISSN
- 1364-6613 (ISSN-L)
- PMC
- PMC4350769
- OpenAlex
- W2092349579
- Cited by
- 577
- References
- 79
- Citations by year
- 2026: 28 · 2025: 60 · 2024: 37 · 2023: 34 · 2022: 33 · 2021: 43 · 2020: 34 · 2019: 38 · 2018: 47 · 2017: 30 · 2016: 36 · 2015: 30 · 2014: 28 · 2013: 26 · 2012: 36
- FWCI
- 1.84
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Trends in Cognitive Sciences (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Funders
- Biotechnology and Biological Sciences Research Council (BB/E009174/1)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD060306, HD-060306)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
- Life Sciences › Neuroscience › Cognitive Neuroscience › Free Will and Agency
- Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
- Keywords
- motor coordination, optimal feedback control, optimal control, work distribution, hierarchical control, movement initiation, voluntary motor control
- MeSH terms
- Animals, Feedback, Humans, Models, Neurological, Movement, Psychomotor Performance
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review