Journal of Psycholinguistic Research

, Volume 30, Issue 3, pp 339–364 | Cite as

An Event-Related fMRI Study of Syntactic and Semantic Violations

  • Aaron J. Newman
  • Roumyana Pancheva
  • Kaori Ozawa
  • Helen J. Neville
  • Michael T. Ullman


We used event-related functional magnetic resonance imaging to identify brain regions involved in syntactic and semantic processing. Healthy adult males read well-formed sentences randomly intermixed with sentences which either contained violations of syntactic structure or were semantically implausible. Reading anomalous sentences, as compared to well-formed sentences, yielded distinct patterns of activation for the two violation types. Syntactic violations elicited significantly greater activation than semantic violations primarily in superior frontal cortex. Semantically incongruent sentences elicited greater activation than syntactic violations in the left hippocampal and parahippocampal gyri, the angular gyri bilaterally, the right middle temporal gyrus, and the left inferior frontal sulcus. These results demonstrate that syntactic and semantic processing result in nonidentical patterns of activation, including greater frontal engagement during syntactic processing and larger increases in temporal and temporo-parietal regions during semantic analyses.

language syntax semantics fMRI sentence processing 


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  1. Bader, M. (1998). Prosodic influences on reading syntactically ambiguous sentences. In J. D. Fodor, & F. Ferriera (Eds.), Reanalysis in sentence processing, (pp. 1–46). Dordrecht: Kluwer Academic.Google Scholar
  2. Bavelier, D., Corina, D., Jezzard, P., Padmanabhan, S., Clark, V. P., Karni, A., Prinster, A., Braun, A., Lalwani, A., Rauschecker, J. P., Turner, R., & Neville, H. (1997). Sentence reading: A functional MRI study at 4 Tesla. Journal of Cognitive Neuroscience,9, 664–686.Google Scholar
  3. Boynton, G. M., Engel, S. A., Glover, G. H., & Heeger, D. J. (1996). Linear systems analysis of functional magnetic resonance imaging in human V1. Journal of Neuroscience, 16, 4207–4221.PubMedGoogle Scholar
  4. Binder, J. R., Swanson, S. J., Hammeke, T. A., Morris, G. L., et al. (1996). Determination of language dominance using functional MRI: A comparison with the Wada test. Neurology, 46,978–984.PubMedGoogle Scholar
  5. Brewer, J. B., Zhao, Z., Desmond, J. E., Glover, G. H., & Gabrieli, J. D. (1998). Making memories: Brain activity that predicts how well visual experience will be remembered. Science, 281, 1185–1187.PubMedGoogle Scholar
  6. Buckner, R. L., Bandettini, P. A., O'Craven, K. M., Savoy, R. L., Petersen, S. E., Raichle, M. E., & Rosen, B. R. (1996). Detection of cortical activation during averaged single trials of a cognitive task using functional magnetic resonance imaging. Proceedings of the National Academy of Sciences,93, 14878–14883.Google Scholar
  7. Buckner, R. L., & Koutstaal, W. (1998). Functional neuroimaging studies of encoding, priming, and explicit memory retrieval. Proceedings of the National Academy, 95, 891.Google Scholar
  8. Caplan, D., Alpert, N., & Waters, G. (1998). Effects of syntactic structure and propositional number on patterns of regional cerebral blood flow. Journal of Cognitive Neuroscience, 10, 541–552.PubMedGoogle Scholar
  9. Caramazza, A., Berndt, R. S., Basili, A. G., & Koller, J. J. (1981). Syntactic processing deficits in aphasia. Cortex, 17, 333–348.PubMedGoogle Scholar
  10. Chomsky, N. (1965). Aspects of the theory of syntax. Cambridge, MA: MIT Press.Google Scholar
  11. Cohen, N. J., & Squire, L. R. (1980). Preserved learning and retention of pattern-analyzing skill in amnesia: dissociation of knowing how and knowing what. Science, 210, 207–210.Google Scholar
  12. Coulson, S., King, J. W., & Kutas, M. (1998). Expect the unexpected: Event-related brain response to morphosyntactic violations. Language & Cognitive Processes, 13, 21–58.Google Scholar
  13. Courtney, S. M., Petit, L., Maisog, J. M., Ungerleider, L. G., & Haxby, J. V. (1998). An area specialized for spatial working memory in human frontal cortex. Science,279, 1347–1351.PubMedGoogle Scholar
  14. Cox, R. W. (1996). AFNI: Software for analysis and visualization of functional magnetic resonance neuroimages. Computers and Biomedical Research,29, 162–173.PubMedGoogle Scholar
  15. Cox, R. W., & Hyde, J. S. (1997). Software tools for analysis and visualization of fMRI data. NMR in Biomedicine, 10, 171–178.PubMedGoogle Scholar
  16. Dale, A. M., & Buckner, R. L. (1997). Selective averaging of rapidly presented individual trials using fMRI. Human Brain Mapping, 5, 329–340.Google Scholar
  17. Dale, A. M., & Sereno, M. I. (1993). Improved localization of cortical activity by combining EEG and MEG with MRI cortical surface reconstruction: A linear approach. Journal of Cognitive Neuroscience, 5(2), 162–176.Google Scholar
  18. Damasio, A. R. (1992). Aphasia. New England Journal of Medicine, 326, 531–539.PubMedGoogle Scholar
  19. Damasio, A. R., & Damasio, H. (1992). Brain and language. Scientific American, 267, 88–95.Google Scholar
  20. Dehaene, S., Dupoux, E., Mehler, J., Cohen, L., Paulesu, E., Perani, D., van de Moortele, P.-F., Lehericy, S., & Le Bihan, D. (1997). Anatomical variability in the cortical representation of first and second language. Neuroreport,8, 3809–3815.PubMedGoogle Scholar
  21. Demb, J. B., Desmond, J. E., Wagner, A. D., Vaidya, C. J., Glover, G. H., & Gabrieli, J. D. E. (1995). Semantic encoding and retrieval in the left inferior prefrontal cortex: A functional MRI study of task difficulty and process specificity. Journal of Neuroscience, 15, 5870–5878.PubMedGoogle Scholar
  22. Demonet, J.-F., Chollet, F., Ramsay, S., Cardbat, D., Nespoulous, J.-L., Wise R., & Rascol, A. (1992). The anatomy of phonological and semantic processing in normal subjects. Brain, 115, 1753–1768.PubMedGoogle Scholar
  23. Dolan, R. J., & Fletcher, P. F. (1999). Encoding and retrieval in human medial temporal lobes: An empirical investigation using functional magnetic resonance imaging (fMRI). Hippocampus, 9, 25–34.PubMedGoogle Scholar
  24. Embick, D., Marantz, A., Miyashita, Y., O'Neil, W., & Sakai, K. L. (2000). A syntactic specialization for Broca's area. Proceedings of the National Academy of Sciences of the USA, 97, 6150–6154.PubMedGoogle Scholar
  25. Fodor, J. D. (1989). Empty categories in sentence processing. Language and Cognitive Processes, 4, 155–209.Google Scholar
  26. Friederici, A. D. (1995). The time course of syntactic activation during language processing: A model based on neuropsychological and neurophysiological data. Brain & Language, 50, 259–281.Google Scholar
  27. Friederici, A. D. (1996). Diagnosis and reanalysis: Two processing aspects the brain may differentiate. In J. Fodor, & F. Ferreira, (Eds.), Reanalysis in sentence processing. Dordrecht: Kluwer Academic.Google Scholar
  28. Friederici, A. D., & Frisch, S. (2000). Verb argument structure processing: The role of verbspecific and argument-specific information. Journal of Memory and Language, 43, 476–507.Google Scholar
  29. Friederici, A. D., Hahne, A., & von Cramon, D. Y. (1998). First-pass versus second-pass parsing processes in a Wernicke's and a Broca's aphasic: Electrophysiological evidence for a double dissociation. Brain & Language,62, 311–341.Google Scholar
  30. Friederici, A. D., von Cramon, D. Y., & Kotz, S. A. (1999). Language related brain potentials in patients with cortical and subcortical left hemisphere lesions. Brain, 122, 1033–1047.PubMedGoogle Scholar
  31. Friederici, A. D., Wang, Y., Herrmann, C. S., Maess, B., & Oertel, U. (2000). Localization of early syntactic processes in frontal & temporal cortical areas: A magnetoencephalographic study. Human Brain Mapping, 11, 1–11.PubMedGoogle Scholar
  32. Gabrieli, J. D., Corkin, S., Mickel, S. F., & Growdon, J. H. (1993). Intact acquisition and long-term retention of mirror-tracing skill in Alzheimer's disease and in global amnesia. Behavioral Neuroscience, 107, 899–910.PubMedGoogle Scholar
  33. Gibson, E. (1998). Linguistic complexity: Locality of syntactic dependencies. Cognition, 68, 1–76.PubMedGoogle Scholar
  34. Goodgalss, H. (1993). Understanding aphasia. San Diego, CA: Academic Press.Google Scholar
  35. Grabowski, T., Damasio, H., & Damasio, A. R. (1998). Premotor and prefrontal correlates of category-related lexical retrieval. Neuroimage, 7, 232–243.PubMedGoogle Scholar
  36. Graybiel, A. M. (1995). Building action repertoires: Memory and learning functions of the basal ganglia. Current Opinion in Neurobiology, 5, 733–741.PubMedGoogle Scholar
  37. Grimshaw, J. (1979). Complement selection and the lexicon. Linguistic Inquiry, 10, 279–326.Google Scholar
  38. Hagoort, P. (1999). The cognitive architecture of parsing: Evidence from event related brain potentials. Journal of Cognitive Neuroscience,Supplement, p. 9.Google Scholar
  39. Hagoort, P., & Brown, C. M. (1999). The implications of the temporal interaction between syntactic and semantic processes for hemodynamic studies of language. Paper presented at the MGH Visiting Fellowship Program in functional MRI,November 1999.Google Scholar
  40. Hagoort, P., Brown, C., & Groothusen, J. (1993). The syntactic positive shift (SPS) as an ERP measure of syntactic processing. Language & Cognitive Processes,8, 439–483.Google Scholar
  41. Hahne, A., & Friederici, A. D. (1999). Electrophysiological evidence for two steps in syntactic analysis: Early automatic and late controlled processes. Journal of Cognitive Neuroscience, 2, 194–205.Google Scholar
  42. Heindel, W. C., Salmon, D. P., Shults, C. W., Walicke, P. A., & Butters, N. (1989). Neuropsychological evidence for multiple implicit memory systems: a comparison of Alzheimer's, Huntington's, and Parkinson's disease patients. Journal of Neuroscience, 9, 582–587.PubMedGoogle Scholar
  43. Hickok, G., Love, T., Swinney, D., Wong, E., & Buxton, R. B. (1997). Functional MR imaging during auditory word presentation: A single-trial presentation paradigm. Brain & Language, 58, 197–201.Google Scholar
  44. Izvorski, R., & Ullman, M. T. (1999). Verb inflection and the hierarchy of functional categories in agrammatic anterior aphasia. Brain & Language, 69, 288–291.Google Scholar
  45. Izvorski, R., & Ullman, M. T. (2000). Syntactic structure building and the processing of inflection in aphasia. Paper presented at the 13th Annual CUNY Conference on Human Sentence Processing, San Diego.Google Scholar
  46. Josephs, O., Turner, R., & Friston, K. (1997). Event-related fMRI. Human Brain Mapping, 5, 1–7.Google Scholar
  47. Just, M. A., Carpenter, P. A., Keller, T. A., Eddy, W. F., & Thulborn, K. R. (1996). Brain activation modulated by sentence comprehension. Science, 274, 114–116.PubMedGoogle Scholar
  48. Kaan, E., Harris, A., Gibson, E., & Holcomb, P. (2000). The P600 as an index of syntactic integration difficulty. Language and Cognitive Processes, 15, 159–201.Google Scholar
  49. Kiehl, K. A., Laurens, K. R., & Liddle, P. F. (1999). Reading anomalous sentences: An eventrelated fMRI study od semantic processing. Proceedings of the Cognitive Neuroscience Society 6th Annual Meeting, Washington, D.C., April 1999.Google Scholar
  50. Kucera, H., & Francis, W. N. (1967). Computational analysis of present-day American English.Providence, RI: Brown University Press.Google Scholar
  51. Kuperberg, G. E., McGuire, P. K., Bullmore, E. T., Brammer, M. J., Rabe-Hesketh, S., Wright, I. C., Lythogoe, D. J., Williams, S. C. R., & David, A. S. (2000). Common and distinct neural substrates for pragmatic, semantic, and syntactic processing of spoken sentences: An fMRI study. Journal of Cognitive Neuroscience, 12, 321–341.PubMedGoogle Scholar
  52. Kutas, M., & Hillyard, S. A. (1980). Event-related brain potentials to semantically inappropriate and surprisingly large words. Biological Psychology, 11, 9–116.Google Scholar
  53. Kutas, M., & Hillyard, S. A. (1984). Brain potentials during reading reflect word expectancy and semantic association. Nature (London), 307, 161–163.Google Scholar
  54. Lepage, M., Habib, R., & Tulving, E. (1998). Hippocampal PET activations of memory encoding and retreival: the HIPER model. Hippocampus, 8, 313–322.PubMedGoogle Scholar
  55. Martin, A. (1999). Automatic activation of the medial temporal lobe during encoding: Lateralized influences of meaning and novelty. Hippocampus,9, 62–70.PubMedGoogle Scholar
  56. Mazoyer, B. M., Tzourio, N., Frak, V., Syrota, A., Murayama, O., Levrier, O., Salamon, G., Dehaene, S., Cohen, L., & Mehler, J. (1993). The cortical representation of speech. Journal of Cognitive Neuroscience, 5, 467–479.Google Scholar
  57. McCarthy, G., Luby, M., Gore, J., & Goldman-Rakic, P. (1997). Infrequent events transiently activate human prefrontal and parietal cortex as measured by functional MRI. Journal of Neurophysiology,77, 1630–1634.PubMedGoogle Scholar
  58. McCarthy, G., Nobre, A. C., Bentin, S., & Spencer, D. D. (1995). Language-related field potentials in the anterior medial temporal lobe: I. Intracranial distribution and neural generators. Journal of Neuroscience, 15, 1080–1089.PubMedGoogle Scholar
  59. Menon, R. S., Luknowsky, D. C., & Gati, J. S. (1998). Mental chronometry using latencyresolved functional MRI. Proceedings of the National Academy of Sciences of the USA, 95, 10902–10907.PubMedGoogle Scholar
  60. Menon, R. S., & Kim, S.-G. (1999). Spatial and temporal limits in cognitive neuroimaging with fMRI. Trends in Cognitive Sciences, 3, 207–216.PubMedGoogle Scholar
  61. Meyer, M., Friederici, A. D., & von Cramon, D. Y. (2000). Neurocognition of auditory sentence comprehension: Event related fMRI reveals sensitivity to syntactic violations and task demands. Cognitive Brain Research,9, 19–33.PubMedGoogle Scholar
  62. Neter, J., Wasserman, W., & Kutner, M. H. (1985). Applied linear statistics models, 2nd ed. Homewood, IL: Irwin.Google Scholar
  63. Neville, H. J., Nicol, J. L., Barss, A., Forster, K. I., & Garrett, M. (1991). Syntactically based sentence processing classes: Evidence from event-related brain potentials. Journal of Cognitive Neuroscience,3, 151–165.Google Scholar
  64. Newman, A. J., Izvorski, R., Davis, L., Ullman, M. T., & Neville, H. J. (1999). Neural pro-cessing of inflectional morphology: An event-related potential study of English past tense. Poster presented at the 6th Annual Meeting of the Cognitive Neuroscience Society, Washington, DC.Google Scholar
  65. Ni, W., Constable, R. T., Menci, W. E., Pugh, K. R., Fulbright, R. K., Shaywitz, S. E., Shaywitz, B. A., Gore, J. C., & Shankweiler, D. (2000). An event-related neuroimaging study distinguishing form and content in sentence processing. Journal of Cognitive Neuroscience, 12, 120–133.PubMedGoogle Scholar
  66. Nobre, A. C., & McCarthy, G. (1995). Language-related field potentials in the anterior-medial temporal lobe: II. Effects of word type and semantic priming. Journal of Neuroscience, 15, 1190–1098.Google Scholar
  67. Nyberg,, L., Cabeza, R., & Tulving, E. (1996). PET studies of encoding and retrieval: The HERA model. Psychonomic Review Bulletin, 3, 135–148.Google Scholar
  68. Okada, Y. (1983). Neurogenesis of evoked magnetic fields. In S. J. Williamson, G. L. Romani, L. Kaufman, & I. Midena (Eds.). Biomagnetism, an Interdisciplinary Approach (pp. 399–408). New York: Plenum Press.Google Scholar
  69. Osterhout, L., Holcomb, P. J. (1992). Event-related brain potentials elicited by syntactic anomaly. Journal of Memory & Language, 31, 785–806.Google Scholar
  70. Osterhout, L., Holcomb, P., & Swinney, D. (1994). Brain potentials elicited by garden-path sentences: Evidence of the application of verb information during parsing. Journal of Experimental Psychology: Learning, Memory & Cognition, 20(4), 786–803.Google Scholar
  71. Osterhout, L., McKinnon, R., Bersick, M., & Corey, V. (1996). On the language specificity of the brain response to syntactic anomalies: Is the syntactic positive shift a member of the P300 family? Journal of Cognitive Neuroscience,8, 507–526.Google Scholar
  72. Osterhout, L., & Nicol, J. (1999). On the distinctiveness, independence, and time course of the brain responses to syntactic and semantic anomalies. Language and Cognitive Processes, 14, 283–317.Google Scholar
  73. Patel, A. D., Gibson, E., Ratner, J., Besson, M., & Holcomb, P. (1998). Processing syntactic relations in language and music: An event-related potential study. Journal of Cognitive Neuroscience, 10, 717–733.PubMedGoogle Scholar
  74. Pesetsky, D. (1982). Doctoral Dissertation, MIT, Cambridge, MA.Google Scholar
  75. Phillips, J. W., Leahy, R. M., & Mosher, J. C. (1997). The MEG-based imaging of focal neuronal current sources. IEEE Transactions in Medical Imaging, 16(3), 338–348.Google Scholar
  76. Posner, M. I. (1986). I. Overview. In K. R. Boff, & L. Kaufman, et al. (Eds.), Handbook of perception and human performance, Vol.2: Cognitive processes and performance. (pp. 3–10). New York: Wiley.Google Scholar
  77. Price, C. J., Moore, C. J., Humphreys, G. W., Wise, R. J. S. (1997). Segregating semantic from phonological processes during reading. Journal of Cognitive Neuroscience, 9(6), 727–733.Google Scholar
  78. Richter, W., Ugurbil, K., Georgopoulos, A. P., & Kim, S. G. (1997). Time-resolved fMRI of mental rotation. Neuroreport,8, 3697–3702.PubMedGoogle Scholar
  79. Richter, W., Somorjai, R., Summers, R., Jarmasz, M., Menon, R. S., Gati, J. S., Georgopoulos, A. P., Tegeler, C., Ugurbil, K., & Kim, S. G. (2000). Journal of Cognitive Neuroscience, 12, 310–320.PubMedGoogle Scholar
  80. Rencher, A. C. (1995). Methods of multivariate analysis. New York: Wiley.Google Scholar
  81. Rösler, F., Friederici, A. D., Putz, P., & Hahne, A. (1993). Event-related brain potentials while encountering semantic and syntactic constraint violations. Journal of Cognitive Neuroscience, 5, 345–362.Google Scholar
  82. Rugg, M. D. (1985). The effects of semantic priming and word repetition on event-related potentials. Psychophysiology, 22, 642–647.PubMedGoogle Scholar
  83. Rugg, M. D., & Coles, M. G. H. (Eds.) (1995). Electrophysiology of mind. New York: Oxford University Press.Google Scholar
  84. Schacter, D. L., & Wagner, A. D. (1999). Medial temporal lobe activations in fMRI and PET studies of episodic encoding and retrieval. Hippocampus, 9,7–24.PubMedGoogle Scholar
  85. Simos, P. G., Basile, L. F. H., & Papanicolaou, A. C. (1997). Source localization of the N400 response in a sentence reading paradigm using evoked magnetic fields and magnetic resonance imaging. Brain Research, 762, 29–39.PubMedGoogle Scholar
  86. Squire, L. R., & McKee, R. D. (1993). Declarative and nondeclarative memory in opposition: when prior events influence amnesic patients more than normal subjects. Memory & Cognition, 21, 424–430.Google Scholar
  87. Steinhauer, K., Alter, K., & Friederici, A. D. (1999). Brain potentials indicate immediate use of prosodic cues in natural speech processing. Nature Neuroscience, 2, 191–196.PubMedGoogle Scholar
  88. Steinhauer, K., & Friederici, A. D. (2001). Prosodic boundaries, comma rules, and brain responses: The Closure Positive Shift in the ERPs as a universal marker for prosodic phrasing in listeners and readers. Journal of Psycholinguistic Research, 30, 265–293.Google Scholar
  89. Stromswold, K., Caplan, D., Alpert, N., & Rauch, S. (1996). Localization of syntactic comprehension by positron emission tomography. Brain & Language, 52, 452–473.Google Scholar
  90. Tulving, E., Habib, R., Nyberg, L., Lepage, M., & McIntosh, A. R. (1999). Positron emission tomography correlations in and beyond the medial temporal lobe. Hippocampus, 9,71–82.PubMedGoogle Scholar
  91. Tyler, L. K., Ostrin, R. K., Cooke, M., & Moss, H. E. (1995). Automatic access of lexical information in Broca's aphasics: Against the automatically hypothesis. Brain & Language, 48, 131–162.Google Scholar
  92. Ullman, M. T. (2001). “The Declarative/Procedural Model of Language,” Journal of Psycholinguistic Research, 30, 37–69.PubMedGoogle Scholar
  93. Ullman, M., Corkin, S., Coppola, M., Hickok, G., Growdon, J. H., Koroshetz, W. J., & Pinker, S. (1997). A neural dissociation within language: Lexicon, a part of declarative memory, grammar processed by procedural system. Journal of Cognitive Neuroscience, 9, 289–299.Google Scholar
  94. Ullman, M. T., Newman, A., Izvorski, R., & Neville, H. (2000). Electrophysiological correlates of lexicon and grammar: Evidence from inflectional morphology. Paper presented at the 13th Annual CUNY Conference on Human Sentence Processing, San Diego.Google Scholar
  95. Ullman, M. T., Izvorski, R., Love, T., Yee, E., Swinney, D., & Hickok, G. (In press). Neural correlates of lexicon and grammar: Evidence from the production, reading, and judgment of inflection in aphasia. Brain & Language.Google Scholar
  96. Ward, B. D. (2000). Deconvolution of fMRI time series data. Documentation included in the Analysis of Functional Neuroimages software package, available from htpp://varda.biophysics. Scholar
  97. Wagner, A. D., Schacter, D. L., Rotte, M., Koutstaal, W., Maril, A., Dale, A. M., Rosen, B. R., & Buckner, R. L. (1998). Building memories: Remembering and forgetting of verbal experiences as predicted by brain activity. Science, 281, 1188–1191.PubMedGoogle Scholar
  98. Wiggs, C. L., Weisberg, J., & Martin, A. (1999). Neural correlates of semantic and episodic memory retreival. Neuropsychologia, 37, 103–118.PubMedGoogle Scholar
  99. Willingham, D. B. (1998). A neuropsychological theory of motor skill learning. Psychological Review, 105, 558–584.PubMedGoogle Scholar
  100. Wise, S. P., Fried, I., Olivier, A., Paus, T., Rizzolati, G., & Zilles, K. J. (1996). Workshop on the anatomic definition and boundaries of the supplementary sensorimotor area. Advances in Neurology, 70, 489–495.PubMedGoogle Scholar
  101. Woods, R. P., Grafton, S. T., Holmes, C. J., Cherry, S. R., & Mazziotta, J. C. (1998a). Auotmated image registration: I. General methods and intersubject, intramodality validation. Journal of Computer Assisted Tomography, 22, 139–152.PubMedGoogle Scholar
  102. Woods, R. P., Grafton, S. T., Watson,. D. G., Sicotte, N. L., & Mazziotta, J. C. (1998b). Automated image registration: II. Intersubject validation of linear and nonlinear models. Journal of Computer Assisted Tomography, 22, 153–165.PubMedGoogle Scholar
  103. Zarahn, E., Aguirre, G., & D'Esposito, M. (1997). A trial-based experimental design for fMRI. Neuroimage, 6, 122–138.PubMedGoogle Scholar

Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Aaron J. Newman
    • 1
  • Roumyana Pancheva
    • 2
    • 3
  • Kaori Ozawa
    • 2
  • Helen J. Neville
    • 1
  • Michael T. Ullman
    • 2
  1. 1.Psychology Department and Institute of NeuroscienceUniversity of OregonEugene
  2. 2.Department of NeuroscienceGeorgetown UniversityWashington, DC
  3. 3.University of Southern CaliforniaLos Angeles

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