Saturday 10 May 2014

Squid Reveal the Sweet Side of Pain

By Tanya Lewis, Staff Writer | May 08, 2014 02:44pm ET

Lasting feelings of pain or anxiety after an injury may seem perplexing, but they serve an evolutionary purpose, research suggests.

Squid that behave more vigilantly after even a minor injury are more likely to survive than their more brazen counterparts, a new study reveals. The findings suggest that persistent pain may be more useful than once thought, according to the study published today (May 8) in the journal Current Biology.

This study provides the first direct evidence to suggest that animals developed heightened sensitivity— which promotes pain in some animals — in response to natural selection, particularly to avoid predators, said study researcher Edgar Walters, a biologist at the University of Texas Medical School at Houston.

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