Consciousness
Animal sentience: concepts, evidence, methods
Open access · cc by · source: Europe PMC
Surveys broad versus valenced sentience, fish and invertebrate controversies, and theory-light empirical strategies.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Which animals are sentient is an open, species-by-species evidence question.
Valenced experience (feeling good or bad) is treated as a key ground of moral status; cephalopod sentience is widely accepted, decapods remain more controversial, and fish pain evidence is concentrated in a few species, so a 'theory-light' research strategy is recommended.
Evidence for the claim as stated.
Inspect source passages
Animal sentience: concepts, evidence, methods
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
'Fish' is a paraphyletic grouping containing over 50 orders.
What we commonly call ‘fish’ are not actually a single clade, but rather a paraphyletic grouping containing over 50 orders grouped into three separate classes: jawless fish such as hagfish and lampreys, cartilaginous fish such as sharks and rays, and bony fish such as teleosts.
The teleost group still contains around 40 different orders.
While almost all extant fish belong to the teleost group, this group still contains around 40 different orders and we must thus be careful about inferring too much about more distantly related species.
Key findings
Valenced experience is treated as a (often the) ground of moral status; fish generalisations are weak beyond a few teleosts; cephalopod sentience is widely accepted while decapods remain more controversial; disentangling conscious from unconscious affect has no analogue of backward masking.
Methodology
They clarify broad phenomenal versus narrow valenced sentience, show why valence matters for ethics and welfare law, review evidence debates about fish and invertebrates, and recommend a middle-path 'theory-light' research strategy.
Limitations
The article reports no new experiments and does not settle which invertebrates are sentient; fish pain work is concentrated in species such as rainbow trout and zebrafish.
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