Abstract
The purpose of this study was to assess the correspondence of a pictorial-based paired-stimulus preference assessment (PSPA) administered via a speech-generating device with a tangible PSPA. The participant was a 9-year-old boy with severely limited motor ability who had access to a speech-generating device controlled by eye gaze. We conducted two sets of PSPAs with the same tangible stimuli. The dependent variable for both assessments was 2 s of uninterrupted eye gaze. Each assessment format included a within-condition replication controlling for position. Results showed that eye gaze was a reliable dependent variable during the tangible PSPA (i.e., consistent selection across both presentations). However, a strong position bias was observed during the device PSPA.