C. Lloyd Morgan, English zoologist and psychologist (d. 1936)

Conwy Lloyd Morgan (6 February 1852 – 6 March 1936), a distinguished British ethologist and psychologist, left an indelible mark on the scientific understanding of animal behavior and the evolution of complex systems. As a Fellow of the Royal Society (FRS), a highly prestigious accolade recognizing significant contributions to science, Morgan pioneered the experimental approach to animal psychology, advocating for rigorous, objective methods in an era often characterized by anecdotal observations and anthropomorphic interpretations. His legacy is primarily defined by two foundational concepts: the principle known as Morgan's Canon and his profound theory of emergent evolution.

Morgan's Canon: The Principle of Parsimony in Animal Psychology


Morgan's Canon is arguably his most enduring contribution, serving as a cornerstone for scientific methodology in the study of animal behavior. Formulated in his seminal 1894 work, "An Introduction to Comparative Psychology," this principle is a specific application of Occam's Razor to the field of animal cognition. It states: "In no case may we interpret an action as the outcome of the exercise of a higher psychical faculty, if it can be interpreted as the outcome of the exercise of one which stands lower in the psychological scale."


This canon was a direct response to the prevalent tendency among Victorian naturalists to attribute complex human-like emotions, reasoning, and intentions to animals without sufficient empirical evidence. Morgan argued for a more parsimonious interpretation, insisting that if a behavior could be explained by simpler cognitive processes (such as instinct, habit formation, or associative learning), there was no need to invoke more complex ones (like abstract reasoning, empathy, or self-awareness). For instance, if a dog learns to open a gate, Morgan's Canon suggests we should first consider if it's due to simple trial-and-error learning and association rather than assuming it understands the mechanics of latches or possesses abstract problem-solving skills.


The profound impact of Morgan's Canon was its role in shaping the burgeoning field of behaviorism, particularly influencing figures like John B. Watson. It provided a critical methodological framework, encouraging researchers to focus on observable behaviors and the simplest explanations for them, thereby promoting a more objective and experimental approach to animal psychology. It helped move the field away from unscientific speculation towards empirical investigation.

The Theory of Emergent Evolution: Complexity from Simplicity


Beyond his methodological contributions to animal psychology, Conwy Lloyd Morgan also developed the philosophical and scientific concept of "emergent evolution." This theory posits that as evolution progresses, new properties or qualities can "emerge" at higher levels of complexity that are qualitatively different from, and cannot be entirely reduced to or predicted from, the properties of the constituent parts at lower levels. For example, the property of "wetness" emerges from the interaction of water molecules, but an individual water molecule is not "wet." Similarly, consciousness, or "mind," was seen by Morgan as an emergent property of complex biological organization, not merely a sum of simpler neural activities.


Morgan's emergent evolution proposed a hierarchical view of reality, where novelty arises through natural processes without necessarily invoking supernatural intervention. It offered a middle ground between purely mechanistic, reductionist views of the universe and vitalist or purely spiritual explanations for life's complexity and the evolution of consciousness. This theory was influential in early 20th-century philosophy of science and biology, providing a framework for understanding how qualitative leaps occur in natural systems, from the formation of atoms to the development of living organisms and minds.

Legacy and Broader Influence


Conwy Lloyd Morgan's work effectively bridged the fields of psychology, biology, and philosophy. His insistence on an experimental, parsimonious approach to animal behavior laid critical groundwork for modern ethology and comparative psychology, ensuring that these disciplines maintained scientific rigor. Simultaneously, his theory of emergent evolution provided a compelling way to conceptualize the development of complex systems, from the physical world to the intricacies of the mind, and continues to be relevant in discussions about systems theory, complexity, and consciousness.

Frequently Asked Questions About Conwy Lloyd Morgan

Who was Conwy Lloyd Morgan?
Conwy Lloyd Morgan (1852-1936) was a prominent British ethologist and psychologist, recognized as a pioneer in the scientific study of animal behavior and a Fellow of the Royal Society (FRS).
What is Morgan's Canon?
Morgan's Canon is a principle of parsimony in animal psychology stating that if a behavior can be explained by simpler mental faculties, one should not attribute it to more complex ones. Its core tenet is: "In no case may we interpret an action as the outcome of the exercise of a higher psychical faculty, if it can be interpreted as the outcome of the exercise of one which stands lower in the psychological scale."
Why is Morgan's Canon important?
It was crucial for bringing scientific rigor and objectivity to the study of animal behavior, countering anthropomorphism (attributing human characteristics to animals) and significantly influencing the development of behaviorism by emphasizing observable actions and simpler explanations.
What is the theory of emergent evolution?
Emergent evolution, proposed by Morgan, is a philosophical and scientific theory suggesting that new, qualitatively distinct properties or qualities can arise ("emerge") at higher levels of complexity in evolutionary processes that cannot be fully predicted or explained by the properties of their simpler constituent parts.
How did Conwy Lloyd Morgan contribute to science?
He contributed by advocating for an experimental approach to animal psychology, formulating Morgan's Canon to ensure methodological rigor, and developing the theory of emergent evolution to explain the emergence of complexity and new properties (like mind) in the natural world.