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How Skinner's pigeon experiment revealed signs of superstition in pigeons.

They may seem unlikely candidates for psychological analysis, but pigeons have given a revealing insight into how animals, including humans, can be bound by superstition...

The Superstition Experiment

In the Summer of 1947, renowned psychiatrist Skinner published his study on a group of pigeons that showed even animals are susceptible to the human condition that is superstition.

Skinner conducted his research on a group of hungry pigeons whose body weights had been reduced to 75% of their normal weight when well-fed. For a few minutes each day, a mechanism fed the birds at regular intervals. What observers of the pigeons found showed the birds developing superstitious behaviour, believing that by acting in a particular way, or committing a certain action, food would arrive.

Common Superstitions
  • Spilling salt
  • Walking under ladders
    In Medieval times, people were hung from ladders before the invention of gallows. Walking under one represented your own execution. A religious explanation is based on triangles representing the Holy Trinity. Walking through the triangle created by the ladder, ground and wall was considered sacrilegious.
  • Seeing a partner in a wedding dress
    ...before the marriage ceremony takes place.
  • Breaking mirrors
    As a mirror is a reflection of a person, it has been thought to represent one's soul, therefore breaking it - and in doing so, damaging one's soul, is thought to bring 7 years of bad luck.

What Skinner Discovered

By the end of the study, three quarters of the birds had become superstitious. One pigeon, in pursuit of food, believed that by turning around in the cage twice or three times between being fed, but not just in any direction; the bird learnt to turn anti-clockwise and appeared to believe that this would mean it being fed.

Now, it's easy to dismiss such behaviour as normal - a bird in a cage might be expected to exercise a little. But the other birds developed unique supertitious behaviours in an attempt to gain a meal.

Other behaviors the observers discovered include what they described as a 'pendulum' movement of the head, and a regular nodding movement in another bird.

Human Superstition

Skinner's Pigeon Experiment revealed that even pigeons can be conditioned to develop superstitious behaviours in belief that they will be fed. But superstition is more obvious in everyday human behaviour; for example, avoiding 3 consecutive grates in a street, or walking under ladders.

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