In the depths of the oceans lies an alien mind capable of undermining our certainties about the evolution of consciousness. Until now, the use of reflective surfaces as abstract tools to interpret the surrounding environment was considered an exclusive privilege of some higher vertebrates, such as mammals and birds.
Groundbreaking research conducted by Dartmouth College and published in the journal Current Biology However, he broke this scientific dogma. Scientists have demonstrated that the California two-spotted octopus (Octopus bimaculoides) is able to process mirror images to locate and intercept food sources hidden from view, making a prodigious leap in spatial cognition never before documented in an invertebrate.
The Dartmouth protocol: virtual crabs to fool chemoreceptors
The research, coordinated by the scientist Mary Kieseler and the cognitive neuroscientist Peter Tse, involved three specimens within the laboratories of the US university. Training a cephalopod requires millimetric scientific attention: these animals in fact possess sophisticated chemoreceptors on their tentacles that allow them to smell and taste simply through touch.
To prevent olfactory or tactile stimuli from guiding the animal and invalidating the visual test, the team replaced real prey with virtual images of crabs projected on screens. The octopus was placed inside a transparent cabin open at the top and front, positioned directly in front of a mirror; the optical illusion of the crustacean appeared behind him, visible only through the reflective surface.
The 180 degree maneuver and the internal mental map hypothesis
The results exceeded the researchers’ expectations. Instead of naively hurling themselves at the mirror, the octopuses decoded the geometric information by performing a 180-degree navigation maneuver or climbing over the walls of the structure to hit the exact spot of the projection, thus obtaining a real live crab as a reward.
The specimens intercepted the correct trajectory in 73% of the overall attempts. Although aerial tracking revealed that the molluscs did not always choose the geometrically shortest line, their speed in reaching the target steadily increased. This ability suggests that cephalopods do not passively assimilate simple rewarded visual associations, but possess a sophisticated internal representation of space, a mental map indispensable for rapidly hunting on coral reefs.
Evolutionary convergence: a mind born from a common worm-shaped ancestor
The philosophical and biological significance of this discovery shakes the foundations of evolutionary biology. The human species and the cephalopods separated onto different branches of the tree of life a long time ago; our last common ancestor was a worm that lived between 350 and 500 million years ago.
The fact that an organism so distant from us has autonomously developed the ability to exploit a mirror to process geographical reality indicates a phenomenon of evolutionary convergence. Radically different species, when subjected to the same ecological pressures, can generate symmetric neuronal solutions to solve complex environmental puzzles.
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