Bill Nguyen

The explanatory challenge of sentience is known as the “hard problem of consciousness”: How does subjective experience arise from physical objects and their relations? Despite some optimistic claims, the perennial struggle with this question shows little evidence of imminent resolution. In this article I focus on the “why” rather than on the “how” of sentience. Specifically, why did sentience evolve in organic lifeforms? From an evolutionary perspective this question can be framed: “What adaptive problem(s) did organisms face in their evolutionary past and how were those challenges met? I argue that sentience was a critical component of the adaptive solution (i.e., adopting an agentic stance) to increasingly complex and unpredictable demands placed on vertebrates approximately 500 million years ago (the so-called Cambrian explosion). One consequence of taking an agentic stance is that it freed the organism from its neural moorings, positioning it within phenomenal space outside its brain.

Masciari (2025) examines the “motivational barriers” which can compromise patient adherence to treatment decisions. On this foundation, they consider interventions that may alleviate such barriers. In this commentary, I begin with a brief clarification of Masciari’s use of evolutionary adaptation. With the original argument’s empirical boundaries more transparently outlined, I then discuss how paternalistic objections against motivational interventions can be further settled by establishing why and how motivational interventions, not simply medical treatment, should be decided by the patient.