Ewan Dunbar
ˈju ən ˈdʌn ˌbɑɹ
Speech · Phonology · Learning
Modelling speech perception and learning · Sound inventories · Low resource speech technology · Decoding neural network representations · Controllable speech synthesis · Open and replicable science
use the link bar above to navigate between my active research projects.
papers referenced below:
  • maldonado, dunbar, and chemla (2019), behavior research methods
  • team members on this work:
    • mora maldonado (now at university of edinburgh)
    • amelia kimball (post-doctoral researcher, université de paris)
    • aixiu an (phd student, université de paris)
    • juliette millet (phd student, université de paris/inria)
    • nika jurov (now phd student, university of maryland)
    • emmanuel dupoux (inria/école normale supérieure/facebook research)
    • sébastien gadioux (now master's student, université de paris)
    • adèle richard (now master's student, université de paris)
    • nicolas brasset (now master's student, université de paris)
    • clara delacourt (master's student, université de paris)
    • antoine hédier (now master's student, université de paris)
    • lucas ondel (brno university of technology)
    • mathieu bernard (inria/école normale supérieure)
    • julien karadayi (inria/école normale supérieure)
    • robin algayres (inria/école normale supérieure)
    • lucie miskic (master's student, université de paris)
    • charlotte dugrain (master's student, université de paris)
    • sakriani sakti (riken/naist)
    • roland thiollière (now at oscaro)
    • beyza taşdelen (now master's student, université de paris)
    • emmanuel chemla (cnrs/école normale supérieure)

    The replicability crisis refers to the large accumulation of results reported in the literature (in both behavioral science and artificial intelligence, among other fields) which have turned out to be false positives or to be otherwise unreproduceable (Gelman 2015; Ioannidis 2005; Pashler & Wagenmakers, 2012).

    The preponderance of such results has been attributed to two kinds of widespread situations. The first is where inappropriate conclusions by the researchers are drawn on the basis of the data, either knowingly or unknowingly, often by the use of inappropriate data analysis such as wrong tests, tests which are guaranteed to fail due to lack of statistical power, unreported negative results in the same or similar studies, or inappropriate practices such as developing the statistical analysis on-the-fly after data is collected, which introduces hidden degrees of freedom via the analyst’s choices. The second type of situation giving rise to unreproduceable results is that, after publication, data, materials, experiment scripts, or analysis scripts, are non-existent, lost, inaccessible, or contain known errors.

    Many measures have been proposed to counteract the replicability crisis, for example:

    Some or all of these practices are in place on almost all of the research projects described here. The experiments currently being prepared on the GEOMPHON project were in part intended as a methodological exercise in pre-validation of statistical analyses and full reproducibility.

    Quantitative measures for mouse-tracking

    Reliable and interpretable methodology, including a careful choice or construction of dependent measures, is a critical part of ensuring the reliability of the experimental results we obtain.

    In mouse tracking, participants perform a task (typically a two-way forced choice) by clicking on buttons on the screen. Their mouse movements toward the buttons are tracked and analyzed, to draw inferences about the cognitive processes underlying their decisions. For example, Dale and Duran (2011) tracked mouse trajectories as participants clicked on True or False in response to generic statements such as Cars have wings or Cars have no wings. Mouse trajectories in negated sentences tended to first move towards the incorrect response (see figure inline from our replication: the upper left is the position of the incorrect answer button, and the upper right the position of the correct answer button).

    Dale and Duran interpreted this as evidence for two-step processing of negation: truth conditions are calculated first for the positive version of the sentence and negated in a second step. However, the analysis of mouse tracking data is complicated by the fact that the trajectory extends over time and in two spatial dimensions, and must somehow be reduced to an informative measure (for example, the degree to which it is bowed towards the incorrect answer). The measures used in the literature are ad hoc and come with no guarantee they are actually measuring anything relevant to the unfolding decision process.

    In Maldonado, Dunbar, and Chemla (2019), we proposed a novel measure of “degree of trajectory deviation,” constructed in a grounded way. We first collected data for which we knew the participants’ mouse trajectories to be deviated towards the wrong answer. Participants moved the mouse toward one of two buttons indicating the colour of a frame around the experiment window, but, on some trials, the frame switched colours in the middle of the trial, changing the correct answer from red to blue or conversely (right). We then trained a simple classifier to combine the features of these trajectories relevant to detecting deviations into a single measure of “degree of deviatedness.”

    This function can then be applied to any trajectory. We showed that our new measure worked at least as well as existing mouse tracking measures, and used it to analyse a replication of Dale and Duran’s (2011) study.

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