The decline of instinct theory in psychology unfolded over the early 20th century as researchers realised that the vast lists of “instincts” proposed by pioneers like William James (1890) and William McDougall (1908) lacked empirical rigor and explanatory power, prompting behaviourists such as John B. Watson (1913) to argue that human behaviour is shaped primarily by learning and environment rather than fixed, inherited impulses.

This shift accelerated with Edward L. Thorndike’s and B. F. Skinner’s demonstrations that behaviour could be systematically modified through conditioning. It culminated in mid-century cognitive approaches showing that human action is guided by flexible goals, beliefs, and problem-solving rather than rigid biological drives. This development not only refined scientific understanding but also empowered individuals and societies to emphasise education, social support, and intentional self-regulation as pathways to wellbeing, liberating people from the fatalistic view that behaviour is predetermined and encouraging policies that cultivate healthier, more adaptive environments (James, 1890; McDougall, 1908; Watson, 1913; Skinner, 1953). These developments have enabled us to take a broader view of motivation, helping us to move towards a more nuanced understanding of the instinct concept.

From a Christian perspective, the decline of instinct theory in psychology is often viewed as a corrective to overly reductionistic accounts of human behaviour that explain human action primarily through inherited biological drives while neglecting the spiritual, moral, and relational dimensions of personhood.

We have seen that early instinct theorists such as William McDougall argued that numerous instincts underlie human conduct, particularly in An Introduction to Social Psychology (1908), while William James had earlier proposed a large repertoire of human instincts in The Principles of Psychology (1890). However, the rise of behaviourism, especially through the work of John B. Watson in 1913, challenged instinct explanations by emphasising learning and environmental influences, and later empirical critiques further weakened instinct theory’s explanatory power. Christians may welcome this shift insofar as it recognises that human beings cannot be adequately understood as bundles of instincts alone.

Scripture portrays people as created in the image of God (Genesis 1:26–27), possessing moral responsibility (Deuteronomy 30:19; Romans 2:6–8), rationality, and the capacity for spiritual transformation (Romans 12:2). Theologically, while humans possess natural drives associated with their created nature, Christian thought has traditionally emphasised the interplay of creation, fall, free agency, conscience, and divine grace, suggesting that human behaviour reflects more than biological inheritance and is ultimately rooted in a holistic understanding of persons as embodied souls accountable before God. Christianity upholds the principle of bringing all aspects of our human personhood, including our instincts, into submission to Christ.