Mand Modality Preference Assessments among High- and Low-Tech Options for Individuals with Intellectual and Developmental Disabilities: A Systematic Review.

The extant literature demonstrates that individuals with intellectual and developmental disabilities (IDD) exhibit preferences among communication modalities when multiple modalities are available and produce reinforcement on identical reinforcement schedules. High- and low-tech communication options, such as voice output devices and picture cards, are commonly recommended for individuals with limited vocal communication skills. In this study, we conducted a systematic literature review of research studies that implemented mand modality preference assessments (MMPAs) that included both a high- and low-tech communication option with individuals with IDD. We identified 27 studies meeting our inclusion criteria and summarized the participant demographics, MMPA design and procedural variations, and MMPA outcomes. The results suggested that high-tech communication options were generally more preferred over low-tech options. However, there was a high degree of variability in how the studies were conducted and conclusions were reached. We discuss some of the current research gaps and the implications for clinical practice.