WOW, PETA people really are crazy!

[Kaj]

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Anyone who has taken an introductory psychology course knows that pain perception is not merely an automatic reaction to stimulus, but has many contributing factors such as expectation, personality and mood.

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And anyone who has stepped on a tack or watched a dog step on a tack knows that both feel physical pain through similar biological mechanisms. So to take any subtle differences and pretend that means there are few similarities is disingenuous.