It would be amazing if we could put ourselves inside the minds of other animals – do they think, feel and reason like we do? Or are they little more than glorified robots? Or something in between? At the moment, we don’t know much. It’s impossible to experience the consciousness of another human, let along another species – and extremely hard to figure out what other species ‘feel’.
This problem was not conveyed very well by last week’s ‘news’ that ‘fish don’t feel pain’. This was actually based on a review article – not on new evidence – which only concluded that ‘fishes are unlikely to feel pain’. Not quite the same as saying they definitively don’t (something that would be impossible to prove, anyway). There’s an interesting analysis of the review on the Practical Fishkeeping website that disputes the review’s conclusion, with help from an expert in the field.
What really didn’t come across from the media coverage is how difficult it is to draw any conclusions at all about what fish actually feel. The arguments can go either way – if fish recoil from painful stimuli, does this mean they consciously feel pain, or that they are unconsciously and ‘instinctively’ removing themselves from danger?
Luckily, another news story this week – about pain in crustaceans – shows how a cleverly designed experiment can shed a bit more light on a tricky subject like this. The study showed that crabs can learn to avoid electric shocks, going to the extreme of leaving shelter and venturing out into the open – something they’re not normally keen to do. (more…)