Smart Birds

Are birds smarter than mathematicians? Pigeons (Columba livia) perform optimally on a version of the Monty Hall Dilemma

Walter Herbranson & Julia Schroeder
Journal of Comparative Psychology, February 2010, Pages 1-13

Abstract: The “Monty Hall Dilemma” (MHD) is a well known probability puzzle in which a player tries to guess which of three doors conceals a desirable prize. After an initial choice is made, one of the remaining doors is opened, revealing no prize. The player is then given the option of staying with their initial guess or switching to the other unopened door. Most people opt to stay with their initial guess, despite the fact that switching doubles the probability of winning. A series of experiments investigated whether pigeons (Columba livia), like most humans, would fail to maximize their expected winnings in a version of the MHD. Birds completed multiple trials of a standard MHD, with the three response keys in an operant chamber serving as the three doors and access to mixed grain as the prize. Across experiments, the probability of gaining reinforcement for switching and staying was manipulated, and birds adjusted their probability of switching and staying to approximate the optimal strategy. Replication of the procedure with human participants showed that humans failed to adopt optimal strategies, even with extensive training.

Really cool study. After reading this I ran into my friends' room and posed to them the MHD. All of them stayed with their original door. Birdbrains.

Dinosaur, post 2

And now for the big question:



Dinosaur or Cleopatra?

I was talking to my mother last Friday after taking a shower and the conversation went a little like this:

Rachel: This head towel thing makes me feel like a Dinosaur.

Gwen: You look more like Cleopatra.

Rachel: Cleopatra? She didn't go around with towels on her head, did she?

Gwen: I don't know... someone back then did I'm sure.

So which is it? You be the judge.

Cleopatra