Psychology has long grappled with its own identity. Is it a natural science, seeking objective, universal laws of the mind, or is it a human science, concerned with the subjective, context-dependent nature of experience? This tension defines the meta-theoretical landscape of the discipline. Historically, much of Western psychology operated from a 'one-person' perspective, treating the individual as a self-contained unit of analysis. The focus was on internal processes: cognition, memory, and motivation, studied in isolation.

The latter half of the 20th century saw a significant shift. The 'two-person' psychology emerged, particularly from psychoanalytic and developmental fields, emphasising that the mind is forged in relationship. This was the beginning of the relational turn, a paradigm shift that reframed the object of study from the isolated individual to the dyad, the group, and the socio-cultural system. It posits that subjectivity itself is intersubjective; we become who we are through our interactions with others. This move challenges the reductionism inherent in purely cognitivist or biological models, arguing that the whole of human experience is greater than the sum of its neurological or computational parts.

This leads to a central conflict: scientific naturalism versus normative humanism. Naturalism aims to explain psychological phenomena through causal, mechanistic accounts, treating thoughts and behaviours like any other natural event. It values objectivity, replicability, and prediction. From this perspective, morality is an epiphenomenon, a product of evolutionary pressures or neural architecture. The goal is descriptive—to explain why people have moral beliefs.

Normative humanism, conversely, argues that psychology cannot and should not be value-neutral. As a discipline concerned with human flourishing, it must engage with normative questions about what constitutes a good life. It sees people not merely as objects of study but as agents navigating a world of meaning, values, and ethical obligations. This perspective criticises scientific reductionism for stripping away the subjective significance of human experience. The goal becomes prescriptive—not just to understand the mind, but to improve the human condition, which is an inherently value-laden project.

This philosophical tension crystallises in psychology's handling of the meta-ethical 'moral problem'. At its core, this problem involves reconciling three plausible but conflicting ideas: Cognitivism, Internalism, and the Humean theory of motivation.

1. Cognitivism: Moral statements express beliefs that can be true or false (e.g., 'Stealing is wrong' is a proposition about the world).
2. Internalism: Sincerely holding a moral belief provides at least some motivation to act in accordance with it. If you truly believe stealing is wrong, you will be motivated, at least to some degree, not to steal.
3. Humean Theory of Motivation: Beliefs alone cannot motivate action. Action requires a combination of a belief and a desire (or some other non-cognitive, conative state).

These three principles form an inconsistent triad. If moral judgments are beliefs (Cognitivism) and beliefs alone don't motivate (Humean Theory), then moral judgments cannot be intrinsically motivating (denying Internalism). Psychological theories often implicitly take a side. For instance, Jonathan Haidt's Social Intuitionist Model leans non-cognitivist, suggesting moral judgments are affective intuitions ('gut feelings') that we later rationalise with post-hoc reasoning. This honours the Humean model and Internalism but challenges pure Cognitivism.

Conversely, theories of moral identity suggest that a cognitive schema of oneself as a 'moral person' (a belief) becomes central to one's identity, thereby gaining motivational force (a desire to be consistent with one's self-concept). This attempts to bridge the gap. An advanced psychology must therefore not only study moral behaviour but also critically examine its own philosophical assumptions about the nature of moral thought and motivation. It must account for the reality that psychological inquiry itself is embedded in a normative framework, whether it acknowledges it or not.

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Navigating these meta-psychological debates is essential for any deep engagement with the discipline. It forces a critical awareness of the assumptions that shape research questions, methodologies, and the very interpretation of what it means to be human.