Abstract
The present study evaluated the relationship between derived relational responding demonstrated by 64 individuals with developmental or intellectual disabilities (90.63% of which had an autism diagnosis) and their corresponding performance on standardized IQ assessments. Participants’ relational abilities were assessed using the Promoting the Emergence of Advanced Knowledge Equivalence Pre-Assessment (PEAK-E-PA), and IQ was assessed using either the WISC-IV Short Form assessment or the WPPSI-III Short Form assessment. The data indicated a strong, significant correlation between participant scores on the PEAK-E-PA and IQ both in terms of raw IQ (r = .843, p < .01), as well as full scale IQ (r = .804, p < .01), which is further analyzed in terms of each of the four subtests of the PEAK-E-PA (reflexivity, symmetry, transitivity, and equivalence). The obtained results have implications for a behavior analytic understanding of factors that relate to the development of intelligent behavior in individuals with disabilities.