Eric Kandel get the Nobel Prize for poking sea slugs because Aplysia cortex is exceptionally easy to study.
Kandel's work with Aplysia, or more particularly, his study on the biological principles of memory preservation, earned him the 2000 Nobel Prize in Physiology or Medicine.
Because of its basic neural system, which allows individual sensory neurons (which detect changes) to only create synapses with single motor neurons, the Aplysia sea slug's reflexes are frequently employed to study memory (which control muscles).
The biggest benefit of Aplysia is its enormous neurons, which make it easier to conduct studies on physiology, biochemistry, and genomics at the level of individual cells and their compartments.
Because Aplysia has a basic neural system with individual sensory neurons (which only sense changes) it is frequently used to investigate memory.
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