In Simons and Chabris's (1999) study on visual inattention, researchers excluded the data of participants who reported prior knowledge of the experimental paradigm or similar studies. Explain why this exclusion was necessary to maintain the internal validity of the study.
33 exam-style questions on OCR A Level Psychology Attention, covering Moray (1959): Auditory attention and Simons and Chabris (1999): Visual inattention. Each one has a worked solution and a mark scheme showing where the marks go.