-Yes (but in relation to the outcome)
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-The authors used a Student t tests to compare means instead of using a mixed-model ANOVA, followed by post-hoc tests if needed.
-The authors did not study how RT (for correct answers) varied with angle, which is the main analysis conducted in the literature on such data. Therefore, without such a (usually linear) trend analysis it is not possible to understand if the overall mean effect observed by the authors is due to a change in slope (reflecting a change in processing speed) or in intercept (reflecting a change in stimulus encoding).
-Between-group difference pre-post significant only with one-sided t-test.
-The between-group difference pre-post is not reported for the simple RT task but it seems that a contribution of the simple RT to the RT of the complex task cannot be excluded.
-Unclear whether errors were also counted.