Animal sentience: concepts, evidence, methods
Surveys broad versus valenced sentience, fish and invertebrate controversies, and theory-light empirical strategies.
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Animal sentience
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Animal sentience: concepts, evidence, methods
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'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.
What they did
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.
What they found
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.
The limits
What it doesn't show
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.
Key terms
- Sentience (broad)
- Capacity for any subjective experience; phenomenal consciousness, 'something it is like'.
- Sentience (narrow)
- Capacity for valenced experiences that feel bad or feel good (affective sentience).
- Valence
- Positive or negative affective character that makes an experience feel good or bad.
- Nociception
- Detection of noxious stimuli; not by itself proof that pain is consciously felt.
- Theory-light strategy
- Build a cluster of abilities linked to consciousness in humans without committing to a full speculative theory.
- Backward masking
- Human method for rendering a stimulus subliminal; no established equivalent for affect.
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Narrow sentience, in this article, is the capacity for
Common questions
Why does the narrow sense matter ethically?
Valenced experience is widely treated as a ground of moral status (Bentham; Singer) and is what welfare law typically tracks.
What did the 2012 Cambridge Declaration claim?
A scientific consensus that humans are not the only sentient beings, citing mammals, birds, and many others including octopuses.
Why caution about 'fish'?
'Fish' is a paraphyletic grouping with over 50 orders; most tests are on a few teleosts, so generalisation is fragile.
What is still unsolved for welfare?
How to disentangle conscious from unconscious affect in animals; there is no affect analogue of backward masking.
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