Now, this, I find interesting...

[Frisco_Slug_Esq]

For the first few years I had her, I was impressed by my late dog Harper's uncanny ability to assess people's character. She hated every crappy landlord and bad roommate. Barked at them. Snarled at them. Wouldn't go near them. But if I brought home a date I liked, Harper, a Shar Pei/Labrador mix, would curl up right next to the woman and turn on the charm. It took me several years to figure out that my dog wasn't a good judge of character; she was just good at reading me. She liked the people I liked and disliked the people who rubbed me the wrong way. For dogs descended from lines bred for protection and companionship, this talent makes sense. A dog adept at distinguishing friend from foe was likely to be kept around and bred, and one very good way to tell friend from foe is to read your master's body language.

My confusion about what was going on in Harper's head reflects a common misconception that is also apparent in the ways dogs are used in criminal investigations. When we think dogs are using their well-honed noses to sniff out drugs or criminal suspects, they may actually be displaying a more recently evolved trait: an urgent desire to please their masters, coupled with the ability to read their cues.

Several studies and tests have shown that drug-sniffing dogs, scent hounds, and even explosive-detecting dogs are not nearly as accurate as they have been portrayed in court. A recent Chicago Tribune survey of traffic stops by suburban police departments from 2007 to 2009, for example, found that searches turned up contraband in just 44 percent of the cases where police dogs alerted to the presence of narcotics. (An alert is a signal, such as barking or sitting, that dogs are trained to display when they detect the target scent.) In stops involving Hispanic drivers, the dogs' success rate was just 27 percent. The two largest departments the Tribune surveyed—the Chicago Police Department and the Illinois State Police—said they don't even keep track of such information.

But don't blame the dogs; their noses work fine. In fact, the Pentagon’s Defense Advanced Research Projects Agency recently conceded, after 12 years and millions of dollars of research, that the canine snout, fine-tuned by millions of years of evolution, is still far more sensitive and reliable than any technology man has been able to muster when it comes to detecting explosives in places such as Iraq and Afghanistan.

The problem is our confusion about when dogs are picking up a scent and when they are responding to cues from their handlers. The Economist's "Babbage" blog summarizes a recent study led by Lisa Lit, a neurologist (and former dog handler) at the University of California-Davis, that demonstrates the startling consequences of that confusion:

Read more here:
http://reason.com/archives/2011/02/21/the-mind-of-a-police-dog

 

[overthebow]

Yeah, but we already knew that.

 

[Saint Peter]

A Shar Pei/Labrador mix?

Why?

 

[Frisco_Slug_Esq]

There seems to be a lab in every woodpile...