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N-Watch: A program for deriving neighborhood size and other psycholinguistic statistics


This article describes a Windows program that enables users to obtain a broad range of statistics concerning the properties of word and nonword stimuli, including measures of word frequency, orthographic similarity, orthographic and phonological structure, age of acquisition, and imageability. It is designed for use by researchers in psycholinguistics, particularly those concerned with recognition of isolated words. The program computes measures of orthographic similarity on line, either with respect to a default vocabulary of 30,605 words or to a vocabulary specified by the user. In addition to providing standard orthographic neighborhood measures, the program can be used to obtain information about other forms of orthographic similarity, such as transposed-letter similarity and embedded-word similarity. It is available, free of charge, from the following Web site: http://www.maccs.mq.edu.au/≈colin/N-Watch/.

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  1. Andrews, S. (1996). Lexical retrieval and selection processes: Effects of transposed-letter confusability.Journal of Memory & Language,35, 775–800.

  2. Andrews, S. (1997). The effect of orthographic similarity on lexical retrieval: Resolving neighborhood conflicts.Psychonomic Bulletin & Review,4, 439–461.

  3. Baayen, R. H., Piepenbrock, R., &van Rijn, H. (1995).The CELEX Lexical Database. Release 2 [CD-ROM]. Linguistic Data Consortium, University of Pennsylvania, Philadelphia.

  4. Balota, D. A., Pilotti, M., &Cortese, M. J. (2001). Subjective frequency estimates for 2,938 monosyllabic words.Memory & Cognition,29, 639–647.

  5. Bird, H., Franklin, S., &Howard, D. (2001). Age of acquisition and imageability ratings for a large set of words, including verbs and function words.Behavior Research Methods, Instruments, & Computers,33, 73–79.

  6. Bowers, J. S., Davis, C. J., & Hanley, D. (2003).Automatic semantic activation of embedded words: Is there a “hat” in “that?” Manuscript submitted for publication.

  7. Brown, G. D., &Watson, F. L. (1987). First in, first out: Word learning age and spoken word frequency as predictors of word familiarity and naming latency.Memory & Cognition,15, 208–216.

  8. Carroll, J. B., &White, M. N. (1973). Word frequency and age of acquisition as determiners of picture-naming latency.Quarterly Journal of Experimental Psychology,25, 85–95.

  9. Chambers, S. M. (1979). Letter and order information in lexical access.Journal of Verbal Learning & Verbal Behavior,18, 225–241.

  10. Coltheart, M. (1981). The MRC Psycholinguistic Database.Quarterly Journal of Experimental Psychology,33A, 497–505.

  11. Coltheart, M., Davelaar, E., Jonasson, J. T., &Besner, D. (1977). Access to the internal lexicon. In S. Dornic (Ed.),Attention and performance VI (pp. 535–555). New York: Academic Press.

  12. Coltheart, M., Rastle, K., Perry, C., Langdon, R., &Ziegler, J. (2001). DRC: A dual-route cascaded model of visual word recognition and reading aloud.Psychological Review,108, 204–256.

  13. Davis, C. J., & Taft, M. (in press). More words in the neighborhood: Interference in lexical decision due to deletion neighbors.Psychonomic Bulletin & Review.

  14. Dennis, S. (1995). The Sydney Morning Herald Word Database.Noetica: Open Forum,1. Available at http://psy.uq.edu.au/cogpsych/noetica/.

  15. Forster, K. I., &Chambers, S. M. (1973). Lexical access and naming time.Journal of Verbal Learning & Verbal Behavior,12, 627–635.

  16. Gernsbacher, M. A. (1984). Resolving 20 years of inconsistent interactions between lexical familiarity and orthography, concreteness, and polysemy.Journal of Experimental Psychology: General,113, 256–281.

  17. Gilhooly, K. J., &Logie, R. H. (1980). Age-of-acquisition, imagery, concreteness, familiarity and ambiguity measures for 1,944 words.Behavior Research Methods & Instrumentation,12, 395–427.

  18. Grainger, J., O’Regan, J. K., Jacobs, A. M., &Segui, J. (1989). On the role of competing word units in visual word recognition: The neighborhood frequency effect.Perception & Psychophysics,45, 189–195.

  19. James, C. T. (1975). The role of semantic information in lexical decisions.Journal of Experimental Psychology: Human Perception & Performance,1, 130–136.

  20. Kučera, H., &Francis, W. N. (1967).Computational analysis of presentday American English. Providence, RI: Brown University Press.

  21. McClelland, J. L., &Rumelhart, D. E. (1981). An interactive activation model of context effects in letter perception: I. An account of basic findings.Psychological Review,88, 375–407.

  22. Monsell, S., Doyle, M. C., &Haggard, P. N. (1989). Effects of frequency on visual word recognition tasks: Where are they?Journal of Experimental Psychology: General,118, 43–71.

  23. Morrison, C. M., Chappell, T. D., &Ellis, A. W. (1997). Age of acquisition norms for a large set of object names and their relation to adult estimates and other variables.Quarterly Journal of Experimental Psychology,50A, 528–559.

  24. Morrison, C. M., &Ellis, A. W. (1995). Roles of word frequency and age of acquisition in word naming and lexical decision.Journal of Experimental Psychology: Learning, Memory, & Cognition,21, 116–153.

  25. Oldfield, R. C., &Wingfield, A. (1965). Response latencies in naming objects.Quarterly Journal of Experimental Psychology,17, 273–281.

  26. Paivio, A., Yuille, J. C., &Madigan, S. A. (1968). Concreteness, imagery, and meaningfulness values for 925 nouns.Journal of Experimental Psychology Monographs,76(Suppl. 2), 1–25.

  27. Pugh, K. R., Rexer, K., &Katz, L. (1994). Evidence of flexible coding in visual word recognition.Journal of Experimental Psychology: Human Perception & Performance,20, 807–825.

  28. Rastle, K., Harrington, J., &Coltheart, M. (2002). 358,534 nonwords: The ARC nonword database.Quarterly Journal of Experimental Psycholog,55A, 1339–1362.

  29. Taft, M., &van Graan, F. (1998). Lack of phonological mediation in a semantic categorization task.Journal of Memory & Language,38, 203–224.

  30. Toglia, M. P., &Battig, W. R. (1978).Handbook of semantic word norms. Hillsdale, NJ: Erlbaum.

  31. Whaley, C. P. (1978). Word-nonword classification time.Journal of Verbal Learning & Verbal Behavior,17, 143–154.

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Author information

Correspondence to Colin J. Davis.

Additional information

Parts of this work were completed while the author was at the Department of Experimental Psychology, University of Bristol.

Note—This article was accepted by the previous editor, Jonathan Vaughan.

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Davis, C.J. N-Watch: A program for deriving neighborhood size and other psycholinguistic statistics. Behavior Research Methods 37, 65–70 (2005). https://doi.org/10.3758/BF03206399

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  • Lexical Decision
  • Word Frequency
  • Letter String
  • Orthographic Neighbor
  • Output Field