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Emily S. Finn

Yale School of Medicine

Functionalist What matters is the organisation of the processing, not the material

The 2015 fingerprinting result gave the identity-marker claim its first hard number. Emily Finn and colleagues identified 126 subjects across scan sessions from resting-state fMRI connectivity alone. Rest-to-rest identification reached 92.9 and 94.4 percent accuracy, and frontoparietal networks carried the signal at 98 to 99 percent. The same functional profile that supports cognition also tags the individual. No fingerprint was engineered. It fell out of the correlation structure the brain generates while doing nothing in particular.

The cross-state result disciplines the claim. Identification across mental states, from rest to task, dropped to 54.0 to 87.3 percent. The fingerprint is stable across sessions and softer across what the brain is doing. That softness is exactly where the state-versus-trait question lives, and it is why the fingerprint literature pairs naturally with consciousness measures that track state, such as the perturbational complexity index.

For the substrate-independence debate, the finding reframes what an emulated brain would have to preserve. A wiring diagram is not the identifier. The identifier is a dynamical profile generated on top of structure, which means a faithful emulation target is a running pattern rather than a static map. Finn’s later work on individual variability in brain dynamics extends the program, and the identity consequences are examined on The Consciousness Fingerprint.

Known for. Connectome fingerprinting, the demonstration that individual brains are identifiable from resting-state functional connectivity

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