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Strong emergence is a type of emergence in which the emergent property is irreducible to its individual constituents. Some philosophers have proposed that qualia and consciousness demonstrate strong emergence. Strong emergence stands in contrast to weak emergence.

Strong emergence says that if systems can have qualities not directly traceable to the system's components, but rather to how those components interact, and one is willing to accept that a system supervenes on its components, then it is difficult to account for an emergent property's cause. These new qualities are irreducible to the system's constituent parts.^[1] The whole is greater than the sum of its parts. This view of emergence is called strong emergence. Strong emergence is a view not widely held in the physical sciences^{[citation needed]} but proposed as a philosophical theory of etiology, epistemology and ontology.

However, "the debate about whether or not the whole can be predicted from the properties of the parts misses the point. Wholes produce unique combined effects, but many of these effects may be co-determined by the context and the interactions between the whole and its environment(s)."^[2] Along that same thought, Arthur Koestler stated, "it is the synergistic effects produced by wholes that are the very cause of the evolution of complexity in nature" and used the metaphor of Janus to illustrate how the two perspectives (strong or holistic vs. weak or reductionistic) should be treated as perspectives, not exclusives, and should work together to address the issues of emergence.^[3] Further,

"The ability to reduce everything to simple fundamental laws does not imply the ability to start from those laws and reconstruct the universe..The constructionist hypothesis breaks down when confronted with the twin difficulties of scale and complexity..At each level of complexity entirely new properties appear..Psychology is not applied biology, nor is biology applied chemistry..We can now see that the whole becomes not merely more, but very different from the sum of its parts."^[4]

The plausibility of strong emergence is questioned by some as contravening our usual understanding of physics. Mark A. Bedau observes:

"Although strong emergence is logically possible, it is uncomfortably like magic. How does an irreducible but supervenient downward causal power arise, since by definition it cannot be due to the aggregation of the micro-level potentialities? Such causal powers would be quite unlike anything within our scientific ken. This not only indicates how they will discomfort reasonable forms of materialism. Their mysteriousness will only heighten the traditional worry that emergence entails illegitimately getting something from nothing." ^[5]

• Anderson, P.W. (1972), "More is Different: Broken Symmetry and the Nature of the Hierarchical Structure of Science", Science 177: 393-396
• Bedau, Mark A. (1997), Weak Emergence, <http://academic.reed.edu/philosophy/faculty/bedau/pdf/emergence.pdf>
• Koestler, Arthur (1969), written at London, A. Koestler & J. R. Smythies, ed., Beyond Reductionism: New Perspectives in the Life Sciences, Hutchinson
• Laughlin, Robert (2005), A Different Universe: Reinventing Physics from the Bottom Down, Basic Books, ISBN 0-465-03828-X

1. ^ Laughlin, 2005.
2. ^ Chalmers, 2002.
3. ^ Koestler, 1969.
4. ^ Anderson, 1972.
5. ^ Bedau, 1997.

• Emergence
• Weak emergence

• Emergence article, 1997.