Behavior Research Methods

, Volume 49, Issue 5, pp 1639–1651 | Cite as

AGSuite: Software to conduct feature analysis of artificial grammar learning performance

  • Matthew T. Cook
  • Chrissy M. Chubala
  • Randall K. Jamieson
Article
  • 102 Downloads

Abstract

To simplify the problem of studying how people learn natural language, researchers use the artificial grammar learning (AGL) task. In this task, participants study letter strings constructed according to the rules of an artificial grammar and subsequently attempt to discriminate grammatical from ungrammatical test strings. Although the data from these experiments are usually analyzed by comparing the mean discrimination performance between experimental conditions, this practice discards information about the individual items and participants that could otherwise help uncover the particular features of strings associated with grammaticality judgments. However, feature analysis is tedious to compute, often complicated, and ill-defined in the literature. Moreover, the data violate the assumption of independence underlying standard linear regression models, leading to Type I error inflation. To solve these problems, we present AGSuite, a free Shiny application for researchers studying AGL. The suite’s intuitive Web-based user interface allows researchers to generate strings from a database of published grammars, compute feature measures (e.g., Levenshtein distance) for each letter string, and conduct a feature analysis on the strings using linear mixed effects (LME) analyses. The LME analysis solves the inflation of Type I errors that afflicts more common methods of repeated measures regression analysis. Finally, the software can generate a number of graphical representations of the data to support an accurate interpretation of results. We hope the ease and availability of these tools will encourage researchers to take full advantage of item-level variance in their datasets in the study of AGL. We moreover discuss the broader applicability of the tools for researchers looking to conduct feature analysis in any field.

Keywords

Shiny application Artificial grammar learning Feature analysis Linear mixed effects analysis 

Notes

Author note

This research was supported by a University of Manitoba Undergraduate Research Award to M.T.C., an NSERC PGS-D to C.M.C., and an NSERC Discovery Grant to R.K.J.

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Copyright information

© Psychonomic Society, Inc. 2017

Authors and Affiliations

  • Matthew T. Cook
    • 1
  • Chrissy M. Chubala
    • 1
  • Randall K. Jamieson
    • 1
  1. 1.Department of PsychologyUniversity of ManitobaWinnipegCanada

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