“…Conversely, after over 25 years of study, behavior analysts have been unable to find systematic and replicable evidence even of symmetry in nonhuman animals assessed the way symmetry is assessed in stimulus equivalence or other derived relational research (Lionello‐DeNolf, ), an ability that is readily shown in human infants (Luciano, Gómez‐Becerra, & Rodríguez‐Valverde, ; Peláez, Gewirtz, Sanchez, & Mahabir, ). Behavior analysts have found in many studies that stimulus equivalence or other derived relational responses appear to relate to human linguistic and cognitive performance in both typically developing and disabled populations, both infants and adults (e.g., Devany, Hayes, & Nelson, ; McLay, Sutherland, Church, & Tyler‐Merrick, ; O'Hora, Pelaez, Barnes‐Holmes, Rae, Robinson, & Chaudhary, ; Peláez et al, ). Furthermore, training in derived relational responding has been consistently shown to increase verbal and cognitive performance in normal and disabled populations, both infants and adults (e.g., Cassidy, Roche, & Hayes, ; Luciano et al, ; Persicke, Tarbox, Ranick, & St. Clair, ; Weil, Hayes, & Cappuro, ) Thus, behavior analysis as a field seems torn about how to proceed conceptually and pragmatically: Nonhuman animals are regularly said to be showing language skills, but the skills known to be key to language in human subjects, nonhuman animals seemingly do not display.…”