Reference
Glossary of octopus cognition
- Vertical lobe
- The octopus's principal learning-and-memory brain structure, functionally analogous to the vertebrate hippocampus; site of long-term potentiation.
- Chromatophore
- A pigment-filled skin cell, each directly controlled by the nervous system and expanded by tiny muscles, enabling near-instant color change.
- Iridophore / Leucophore
- Reflective (iridophore) and white-scattering (leucophore) skin cells that combine with chromatophores to produce structural color and camouflage.
- Semelparity
- A life history in which an animal reproduces a single time and then dies — the norm for most octopuses.
- Optic gland
- An endocrine gland that, after reproduction, drives the octopus's terminal decline (the 'death spiral'); the cephalopod analog of aspects of vertebrate neuroendocrine aging.
- A-to-I RNA editing
- A process that chemically changes adenosine to inosine in RNA, recoding proteins after transcription; unusually widespread in cephalopod neural tissue.
- Long-term potentiation (LTP)
- A durable strengthening of synaptic connections underlying learning and memory; present in the octopus vertical lobe via a distinct nitric-oxide mechanism.
- Axial nerve cord
- The segmented main nerve running down each octopus arm, coordinating local sensing and movement partly independent of the brain.
- Nociception
- The neural detection of harmful stimuli. In octopuses it is accompanied by evidence of affective pain, not just reflex.
- Convergent evolution
- The independent evolution of similar traits in unrelated lineages — e.g. complex cognition arising separately in cephalopods and vertebrates.
- Umwelt
- The self-centered perceptual world of an organism — the specific slice of reality its senses build, central to understanding octopus experience.
- Octopolis / Octlantis
- Two documented high-density octopus aggregation sites off Australia where solitary octopuses display unexpected social behavior.