Burrell, Brian D (2022) Emotional component of pain perception in the medicinal leech?. Animal Sentience 32(12)
Andrew Crump, Heather Browning, Alex Schnell, Charlotte Burn, and Jonathan Birch, Sentience in decapod crustaceans: A general framework and review of the evidence
Crump et al. have provided a series of criteria to assess animal sentience that is focused on the perception of pain, which is known to have both sensory and emotional components. They also provide a qualitative scoring system to assess data that address the eight criteria and apply this paradigm to decapod crustaceans. The criteria laid out have the potential to be applied to other invertebrates typically thought to have sensory response to tissue damage, but no emotional component to pain perception.
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