Final answer:
Gua the chimpanzee's limited language development compared to a human child emphasizes innate constraints on language development, supporting Chomsky's concept of an innate language acquisition device over behaviorism.
Step-by-step explanation:
Dr. Kellogg's observation of Gua's development in comparison to his son Donald illustrates the concept of innate constraints on language development. While Gua and Donald may have been raised under similar environmental conditions, Gua's inability to progress in language development alongside Donald highlights the fact that there are biological limits to what non-human primates can learn in terms of language. This underscores innate biological factors and genetic predispositions that humans possess for language acquisition, suggesting that while environmental factors contribute to language development, they cannot solely account for the differences observed between species in the capacity for language. This standpoint aligns with Noam Chomsky's idea of an innate language acquisition device(LAD), which all humans possess. Additionally, it contrasts with the behaviorist perspective of language development which posits that language is learned solely through reinforcement and feedback.