medium · MCAT psych-soc

A researcher studies a sample of bilingual immigrants and finds that those who report frequently switching between their heritage language and the host-country language show smaller decrements in performance on the Stroop task than monolingual controls. The researcher concludes this reflects superior executive control. A reviewer counters that the finding may instead reflect a confound rooted in how the sample was assembled.

Which feature of the study design, if true, would most directly support the reviewer's alternative explanation rather than the researcher's?

  1. The bilingual participants were recruited from a competitive graduate program, whereas monolingual controls were recruited from the surrounding community
  2. The Stroop task itself was administered in the exact same host-country language for both groups, which equates the linguistic demands of the measure
  3. Bilingual participants self-reported how often they switched between languages using a validated, previously published daily-experience questionnaire instrument
  4. The smaller Stroop decrement observed among frequent switchers held even after researchers statistically controlled for both age and years of formal education

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