Representation of Eye Movements and Stimulus Motion in Topographically Organized Areas of Human Posterior Parietal Cortex
Open accessAbstract
Recent imaging studies have shown that the human posterior parietal cortex (PPC) contains four topographically organized areas along the intraparietal sulcus (IPS1–IPS4). Using a memory-guided saccade paradigm, we confirmed the locations and retinotopic organization of IPS1–IPS4 and identified two additional areas, IPS5 and superior parietal lobule 1 (SPL1). IPS5 is located at the intersection of the intraparietal and postcentral sulcus; SPL1 branches off the IPS and extends into the superior parietal lobule. Both areas, as well as IPS1–IPS4, each contain a representation of the contralateral visual hemifield. We then probed core functions of the dorsal pathway in these areas, that is, the representation of eye movements and visual motion, to compare the functional characteristics of human PPC to physiologically and anatomically defined areas in monkey PPC. First, as in monkey PPC, a gradient representation of eye movements was found along the IPS with decreasing responses for saccades and increasing responses for smooth pursuit eye movements from posterior/medial to anterior/lateral. The greatest preference for saccades was found in SPL1 and for smooth pursuit in IPS5. Second, and again similar to monkey PPC, all topographically organized PPC areas responded to different types of motion including planar, circular, and radial optic flow, as assessed using adaptation paradigms. Areas in posterior IPS preferred radial optic flow over planar motion, whereas areas in anterior PPC did not show preference for a particular motion type. Together, our results indicate strikingly similar characteristics in the general functional organization of human and monkey PPC, but also reveal some notable differences.
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?
Multiple fMRI studies suggest that other functions associated with VIP in non-human primates, such as optic flow movement, or ego-motion and vestibular conscious perception, involve different regions in IPS and surrounding parietal cortex.
“multiple fMRI studies suggest that other functions associated with VIP in non-human primates, such as optic flow movement (Konen and Kastner 2008; Sulpizio et al. 2020), or ego-motion and vestibular conscious perception (Schindler and Bartels 2018; Aedo-Jury et al. 2020), involve different regions in the IPS and the surrounding parietal cortex.”
From Neuroanatomical correlates of peripersonal space: bridging the gap between perception, action, emotion and social cognition (2024) · cites this paper as Konen and Kastner 2008
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
Distributed hierarchical processing in the primate cerebral cortex
Felleman, D. J., & Van Essen, D. C. (1991) · Cerebral Cortex · doi:10.1093/cercor/1.1.1 · Cited by 7,783 · see citing works
SPACE AND ATTENTION IN PARIETAL CORTEX
Colby, C. L., & Goldberg, M. E. (1999) · Annual Review of Neuroscience · doi:10.1146/annurev.neuro.22.1.319 · Cited by 1,710 · see citing works
Statistical data analysis in the computer age
Efron, B., & Tibshirani, R. (1991) · Science · doi:10.1126/science.253.5018.390 · Cited by 1,192 · see citing works
Memory related motor planning activity in posterior parietal cortex of macaque
Gnadt, J. W., & Andersen, R. A. (1988) · Experimental Brain Research · doi:10.1007/bf00271862 · Cited by 998 · see citing works
Mapping of Contralateral Space in Retinotopic Coordinates by a Parietal Cortical Area in Humans
Sereno, M. I., Pitzalis, S., & Martinez, A. (2001) · Science · doi:10.1126/science.1063695 · Cited by 682 · see citing works
Visual-vestibular interactive responses in the macaque ventral intraparietal area (VIP)
Bremmer, F., Klam, F., Duhamel, J., Ben Hamed, S., & Graf, W. (2002) · European Journal of Neuroscience · doi:10.1046/j.1460-9568.2002.02206.x · Cited by 331 · see citing works
A human parietal face area contains aligned head-centered visual and tactile maps
Sereno, M. I., & Huang, R.-S. (2006) · Nature Neuroscience · doi:10.1038/nn1777 · Cited by 322 · see citing works
Ben Hamed, S., Duhamel, J.-R., Bremmer, F., & Graf, W. (2001) · Experimental Brain Research · doi:10.1007/s002210100785 · Cited by 242 · see citing works
Flagged first, then by citations
Research works printed but not linked: 84
- Albright TD 1984 Direction and orientation selectivity of neurons in visual area MT of the macaque J Neurophysiol 52 1106 1130 6520628
- Andersen RA 1997 Multimodal integration for the representation of space in the posterior parietal cortex Philos Trans R Soc Lond B Biol Sci 352 1421 1428 9368930 PMC1692052
- Andersen RA Bracewell RM Barash S Gnadt JW Fogassi L 1990 Eye position effects on visual, memory, and saccade-related activity in areas LIP and 7a of macaque J Neurosci 10 1176 1196 2329374 PMC6570201
- Bandettini PA Jesmanowicz A Wong EC Hyde JS 1993 Processing strategies for time-course data sets in functional MRI of the human brain Magn Reson Med 30 161 173 8366797
- Barash S Bracewell RM Fogassi L Gnadt JW Andersen RA 1991 Saccade-related activity in the lateral intraparietal area. I. Temporal properties; comparison with area 7a J Neurophysiol 66 1095 1108 1753276
- Berman RA Colby CL Genovese CR Voyvodic JT Luna B Thulborn KR Sweeney JA 1999 Cortical networks subserving pursuit and saccadic eye movements in humans: an FMRI study Hum Brain Mapp 8 209 225 10619415 PMC6873313
- Blatt GJ Andersen RA Stoner GR 1990 Visual receptive field organization and cortico-cortical connections of the lateral intraparietal area (area LIP) in the macaque J Comp Neurol 299 421 445 2243159
- Brainard DH 1997 The Psychophysics Toolbox Spat Vis 10 433 436 9176952
- Bremmer F Distler C Hoffmann KP 1997 Eye position effects in monkey cortex. II. Pursuit- and fixation-related activity in posterior parietal areas LIP and 7A J Neurophysiol 77 962 977 9065861
- Bremmer F Schlack A Shah NJ Zafiris O Kubischik M Hoffmann K Zilles K Fink GR 2001 Polymodal motion processing in posterior parietal and premotor cortex: a human fMRI study strongly implies equivalencies between humans and monkeys Neuron 29 287 296 11182099
- Brewer AA Press WA Logothetis NK Wandell BA 2002 Visual areas in macaque cortex measured using functional magnetic resonance imaging J Neurosci 22 10416 10426 12451141 PMC6758759
- Brown MR DeSouza JF Goltz HC Ford K Menon RS Goodale MA Everling S 2004 Comparison of memory- and visually guided saccades using event-related fMRI J Neurophysiol 91 873 889 14523078
- Bruce CJ Goldberg ME Bushnell MC Stanton GB 1985 Primate frontal eye fields. II. Physiological and anatomical correlates of electrically evoked eye movements J Neurophysiol 54 714 734 4045546
- Burkhalter A Van Essen DC 1986 Processing of color, form and disparity information in visual areas VP and V2 of ventral extrastriate cortex in the macaque monkey J Neurosci 6 2327 2351 3746412 PMC6568760
- Colby CL Duhamel JR 1996 Spatial representations for action in parietal cortex Brain Res Cogn Brain Res 5 105 115 9049076
- Colby CL Duhamel JR Goldberg ME 1993 Ventral intraparietal area of the macaque: anatomic location and visual response properties J Neurophysiol 69 902 914 8385201
- Colby CL Duhamel JR Goldberg ME 1996 Visual, presaccadic, and cognitive activation of single neurons in monkey lateral intraparietal area J Neurophysiol 76 2841 2852 8930237
- Constantinidis C Steinmetz MA 1996 Neuronal activity in posterior parietal area 7a during the delay periods of a spatial memory task J Neurophysiol 76 1352 1355 8871242
- Constantinidis C Steinmetz MA 2001 Neuronal responses in area 7a to multiple stimulus displays: II. responses are suppressed at the cued location Cereb Cortex 11 592 597 11415961
- Cooke DF Taylor CS Moore T Graziano MS 2003 Complex movements evoked by microstimulation of the ventral intraparietal area Proc Natl Acad Sci U S A 100 6163 6168 12719522 PMC156343
- Cox RW Jesmanowicz A 1999 Real-time 3D image registration for functional MRI Magn Reson Med 42 1014 1018 10571921
- Duffy CJ 1998 MST neurons respond to optic flow and translational movement J Neurophysiol 80 1816 1827 9772241
- Duffy CJ Wurtz RH 1991 Sensitivity of MST neurons to optic flow stimuli. I. A continuum of response selectivity to large-field stimuli J Neurophysiol 65 1329 1345 1875243
- Duhamel JR Colby CL Goldberg ME 1998 Ventral intraparietal area of the macaque: congruent visual and somatic response properties J Neurophysiol 79 126 136 9425183
- Engel SA Glover GH Wandell BA 1997 Retinotopic organization in human visual cortex and the spatial precision of functional MRI Cereb Cortex 7 181 192 9087826
- Friston KJ Frith CD Turner R Frackowiak RS 1995 Characterizing evoked hemodynamics with fMRI Neuroimage 2 157 165 9343598
- Gaska JP Jacobson LD Pollen DA 1988 Spatial and temporal frequency selectivity of neurons in visual cortical area V3A of the macaque monkey Vision Res 28 1179 1191 3253990
- Gitelman DR 2002 ILAB: a program for postexperimental eye movement analysis Behav Res Methods Instrum Comput 34 605 612 12564563
- Goodale MA Milner AD 1992 Separate visual pathways for perception and action Trends Neurosci 15 20 25 1374953
- Gottlieb JP Bruce CJ MacAvoy MG 1993 Smooth eye movements elicited by microstimulation in the primate frontal eye field J Neurophysiol 69 786 799 8385195
- Graziano MS Andersen RA Snowden RJ 1994 Tuning of MST neurons to spiral motions J Neurosci 14 54 67 8283251 PMC6576843
- Grefkes C Weiss PH Zilles K Fink GR 2002 Crossmodal processing of object features in human anterior intraparietal cortex: an fMRI study implies equivalencies between humans and monkeys Neuron 35 173 184 12123617
- Grefkes CFGR 2005 The functional organization of the intraparietal sulcus in humans and monkeys J Anat 207 3 17 16011542 PMC1571496
- Grill-Spector K Kushnir T Edelman S Avidan G Itzchak Y Malach R 1999 Differential processing of objects under various viewing conditions in the human lateral occipital complex Neuron 24 187 203 10677037
- Hadjikhani N Liu AK Dale AM Cavanagh P Tootell RB 1998 Retinotopy and color sensitivity in human visual cortical area V8 Nat Neurosci 1 235 241 10195149
- Hagler DJ Jr Riecke L Sereno MI 2007 Parietal and superior frontal visuospatial maps activated by pointing and saccades Neuroimage 35 1562 1577 17376706 PMC2752728
- Hawken MJ Parker AJ Lund JS 1988 Laminar organization and contrast sensitivity of direction-selective cells in the striate cortex of the Old World monkey J Neurosci 8 3541 3548 3193169 PMC6569616
- Huerta MF Krubitzer LA Kaas JH 1986 Frontal eye field as defined by intracortical microstimulation in squirrel monkeys, owl monkeys, and macaque monkeys: I. Subcortical connections J Comp Neurol 253 415 439 3793998
- Huk AC Dougherty RF Heeger DJ 2002 Retinotopy and functional subdivision of human areas MT and MST J Neurosci 22 7195 7205 12177214 PMC6757870
- Kastner S De Weerd P Desimone R Ungerleider LG 1998 Mechanisms of directed attention in the human extrastriate cortex as revealed by functional MRI Science 282 108 111 9756472
- Kastner S DeSimone K Konen CS Szczepanski SM Weiner KS Schneider KA 2007 Topographic maps in human frontal cortex revealed in memory-guided saccade and spatial working-memory tasks J Neurophysiol 97 3494 3507 17360822
- Konen CS Kastner S 2008 Two hierarchically organized neural systems for object information in human visual cortex Nat Neurosci 11 224 231 18193041
- Konen CS Kleiser R Seitz RJ Bremmer F 2005 An fMRI study of optokinetic nystagmus and smooth-pursuit eye movements in humans Exp Brain Res 165 203 216 15864563
- Konen CS Kleiser R Wittsack HJ Bremmer F Seitz RJ 2004 The encoding of saccadic eye movements within human posterior parietal cortex Neuroimage 22 304 314 15110020
- Kusunoki M Gottlieb J Goldberg ME 2000 The lateral intraparietal area as a salience map: the representation of abrupt onset, stimulus motion, and task relevance Vision Res 40 1459 1468 10788652
- Lagae L Maes H Raiguel S Xiao DK Orban GA 1994 Responses of macaque STS neurons to optic flow components: a comparison of areas MT and MST J Neurophysiol 71 1597 1626 8064337
- Levy I Schluppeck D Heeger DJ Glimcher PW 2007 Specificity of human cortical areas for reaches and saccades J Neurosci 27 4687 4696 17460081 PMC1876670
- Luna B Thulborn KR Strojwas MH McCurtain BJ Berman RA Genovese CR Sweeney JA 1998 Dorsal cortical regions subserving visually guided saccades in humans: an fMRI study Cereb Cortex 8 40 47 9510384
- Maunsell JH Van Essen DC 1983 Functional properties of neurons in middle temporal visual area of the macaque monkey. II. Binocular interactions and sensitivity to binocular disparity J Neurophysiol 49 1148 1167 6864243
- Merchant H Battaglia-Mayer A Georgopoulos AP 2001 Effects of optic flow in motor cortex and area 7a J Neurophysiol 86 1937 1954 11600652
- Pelli DG 1997 The VideoToolbox software for visual psychophysics: transforming numbers into movies Spat Vis 10 437 442 9176953
- Petit L Clark VP Ingeholm J Haxby JV 1997 Dissociation of saccade-related and pursuit-related activation in human frontal eye fields as revealed by fMRI J Neurophysiol 77 3386 3390 9212283
- Pierrot-Deseilligny C Rivaud S Gaymard B Muri R Vermersch AI 1995 Cortical control of saccades Ann Neurol 37 557 567 7755349
- Press WA Brewer AA Dougherty RF Wade AR Wandell BA 2001 Visual areas and spatial summation in human visual cortex Vision Res 41 1321 1332 11322977
- Robinson DA Fuchs AF 1969 Eye movements evoked by stimulation of frontal eye fields J Neurophysiol 32 637 648 4980022
- Rosano C Krisky CM Welling JS Eddy WF Luna B Thulborn KR Sweeney JA 2002 Pursuit and saccadic eye movement subregions in human frontal eye field: a high-resolution fMRI investigation Cereb Cortex 12 107 115 11739259
- Saito H Yukie M Tanaka K Hikosaka K Fukada Y Iwai E 1986 Integration of direction signals of image motion in the superior temporal sulcus of the macaque monkey J Neurosci 6 145 157 3944616 PMC6568620
- Schaafsma SJ Duysens J 1996 Neurons in the ventral intraparietal area of awake macaque monkey closely resemble neurons in the dorsal part of the medial superior temporal area in their responses to optic flow patterns J Neurophysiol 76 4056 4068 8985900
- Schaafsma SJ Duysens J Gielen CC 1997 Responses in ventral intraparietal area of awake macaque monkey to optic flow patterns corresponding to rotation of planes in depth can be explained by translation and expansion effects Vis Neurosci 14 633 646 9278993
- Schiller PH 1996 On the specificity of neurons and visual areas Behav Brain Res 76 21 35 8734041
- Schlack A Hoffmann KP Bremmer F 2002 Interaction of linear vestibular and visual stimulation in the macaque ventral intraparietal area (VIP) Eur J Neurosci 16 1877 1886 12453051
- Schlack A Hoffmann KP Bremmer F 2003 Selectivity of macaque ventral intraparietal area (area VIP) for smooth pursuit eye movements J Physiol 551 551 561 12826652 PMC2343234
- Schluppeck D Glimcher PW Heeger DJ 2005 Topographic organization for delayed saccades in human posterior parietal cortex J Neurophysiol 94 1372 1384 15817644 PMC2367322
- Schluppeck D Curtis CE Glimcher PW Heeger DJ 2006 Sustained activity in topographic areas of human posterior parietal cortex during memory-guided saccades J Neurosci 26 5098 5108 16687501 PMC1538982
- Schneider KA Richter MC Kastner S 2004 Retinotopic organization and functional subdivisions of the human lateral geniculate nucleus: a high-resolution functional magnetic resonance imaging study J Neurosci 24 8975 8985 15483116 PMC6730047
- Sereno AB Maunsell JH 1998 Shape selectivity in primate lateral intraparietal cortex Nature 395 500 503 9774105
- Sereno MI Dale AM Reppas JB Kwong KK Belliveau JW Brady TJ Rosen BR Tootell RB 1995 Borders of multiple visual areas in humans revealed by functional magnetic resonance imaging Science 268 889 893 7754376
- Siegel RM Read HL 1997 Analysis of optic flow in the monkey parietal area 7a Cereb Cortex 7 327 346 9177764
- Siegel RM Raffi M Phinney RE Turner JA Jando G 2003 Functional architecture of eye position gain fields in visual association cortex of behaving monkey J Neurophysiol 90 1279 1294 12672786
- Silver MA Ress D Heeger DJ 2005 Topographic maps of visual spatial attention in human parietal cortex J Neurophysiol 94 1358 1371 15817643 PMC2367310
- Snyder LH Batista AP Andersen RA 1997 Coding of intention in the posterior parietal cortex Nature 386 167 170 9062187
- Stanton GB Goldberg ME Bruce CJ 1988 Frontal eye field efferents in the macaque monkey: I. Subcortical pathways and topography of striatal and thalamic terminal fields J Comp Neurol 271 473 492 2454970
- Steinmetz MA Motter BC Duffy CJ Mountcastle VB 1987 Functional properties of parietal visual neurons: radial organization of directionalities within the visual field J Neurosci 7 177 191 3806193 PMC6568849
- Swisher JD Halko MA Merabet LB McMains SA Somers DC 2007 Visual topography of human intraparietal sulcus J Neurosci 27 5326 5337 17507555 PMC6672354
- Talairach J Tournoux P 1988 Co-planar stereotaxic atlas of the human brain Stuttgart Thieme
- Thier P Andersen RA 1998 Electrical microstimulation distinguishes distinct saccade- related areas in the posterior parietal cortex J Neurophysiol 80 1713 1735 9772234
- Tolias AS Keliris GA Smirnakis SM Logothetis NK 2005 Neurons in macaque area V4 acquire directional tuning after adaptation to motion stimuli Nat Neurosci 8 591 593 15834417
- Tolias AS Smirnakis SM Augath MA Trinath T Logothetis NK 2001 Motion processing in the macaque: revisited with functional magnetic resonance imaging J Neurosci 21 8594 8601 11606647 PMC6762813
- Tootell RB Mendola JD Hadjikhani NK Liu AK Dale AM 1998 The representation of the ipsilateral visual field in human cerebral cortex Proc Natl Acad Sci U S A 95 818 824 9448246 PMC33803
- Tootell RB Mendola JD Hadjikhani NK Ledden PJ Liu AK Reppas JB Sereno MI Dale AM 1997 Functional analysis of V3A and related areas in human visual cortex J Neurosci 17 7060 7078 9278542 PMC6573277
- Ungerleider LG Mishkin M Ingle DJ Goodale MA Mansfield RJW 1982 Two cortical visual systems Analysis of Visual Behavior 549 586 Cambridge, MA MIT
- Van Essen DC Felleman DJ DeYoe EA Olavarria J Knierim J 1990 Modular and hierarchical organization of extrastriate visual cortex in the macaque monkey Cold Spring Harb Symp Quant Biol 55 679 696 1966771
- Van Essen DC 2001 Mapping visual cortex in monkeys and humans using surface-based atlases Vision Res 41 1359 1378 11322980
- Wade AR Brewer AA Rieger JW Wandell BA 2002 Functional measurements of human ventral occipital cortex: retinotopy and colour Philos Trans R Soc Lond B Biol Sci 357 963 973 12217168 PMC1693014
Cited by
Sorted by citations
The Angular Gyrus: Multiple Functions and Multiple Subdivisions
Seghier, M. L. (2013) · The Neuroscientist · doi:10.1177/1073858412440596 · Cited by 1,585 · see citing works
A new neural framework for visuospatial processing
Kravitz, D. J., Saleem, K. S., Baker, C. I., & Mishkin, M. (2011) · Nature Reviews Neuroscience · doi:10.1038/nrn3008 · Cited by 1,325 · see citing works
A central role for the lateral prefrontal cortex in goal-directed and stimulus-driven attention
Asplund, C. L., Todd, J. J., Snyder, A. P., & Marois, R. (2010) · Nature Neuroscience · doi:10.1038/nn.2509 · Cited by 384 · see citing works
Hutchinson, J. B., Uncapher, M. R., & Wagner, A. D. (2009) · Learning & Memory · doi:10.1101/lm.919109 · Cited by 277 · see citing works
Mapping multisensory parietal face and body areas in humans
Huang, R.-S., Chen, C.-F., Tran, A. T., Holstein, K. L., & Sereno, M. I. (2012) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1207946109 · Cited by 131 · see citing works
Basile, G. A., Tatti, E., Bertino, S., Milardi, D., Genovese, G., Bruno, A., Muscatello, M. R. A., Ciurleo, R., Cerasa, A., Quartarone, A., et al. (2024) · Brain Structure and Function · doi:10.1007/s00429-024-02781-9 · Cited by 24 · see citing works
“Further, multiple fMRI studies suggest that other functions associated with VIP in non-human primates, such as optic flow movement (Konen and Kastner 2008; Sulpizio et al. 2020), or ego-motion and vestibular conscious perception (Schindler and Bartels 2018; Aedo-Jury et al. 2020), involve different…”
BackgroundThe macaque ventral intraparietal area has expanded into three homologue human parietal areas
Foster, C., Sheng, W.-A., Heed, T., & Ben Hamed, S. (2022) · Progress in Neurobiology · doi:10.1016/j.pneurobio.2021.102185 · Cited by 20 · see citing works
Spatiotemporal integration of looming visual and tactile stimuli near the face
Huang, R., Chen, C., & Sereno, M. I. (2018) · Human Brain Mapping · doi:10.1002/hbm.23995 · Cited by 17 · see citing works
- Authors
- Konen, C. S., & Kastner, S.
- Affiliations
- Princeton University (US)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2008-08-13
- Volume
- 28
- Issue
- 33
- Pages
- 8361-8375
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC2685070
- OpenAlex
- W2044504605
- Cited by
- 221
- References
- 8
- Citations by year
- 2026: 6 · 2025: 8 · 2024: 17 · 2023: 17 · 2022: 6 · 2021: 6 · 2020: 11 · 2019: 9 · 2018: 17 · 2017: 10 · 2016: 12 · 2015: 17 · 2014: 11 · 2013: 20 · 2012: 13
- FWCI
- 7.06
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Deutscher Akademischer Austauschdienst
- National Institutes of Health (2r01ey017699-14)
- National Institute of Mental Health (2R01MH64043, P50MH062196, 2P50 MH-62196, R01MH064043)
- National Eye Institute (R01EY-017699, 1R01 EY017699)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
- Life Sciences › Neuroscience › Neurology › Vestibular and auditory disorders
- Keywords
- posterior parietal cortex, intraparietal sulcus, superior parietal lobule, retinotopic organization, saccades, smooth pursuit eye movements, visual motion processing, optical flow, dorsal visual pathway, human-monkey comparison, adaptation paradigm
- MeSH terms
- Adult, Brain Mapping, Eye Movements, Female, Humans, Male, Motion Perception, Parietal Lobe, Photic Stimulation, 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