The Clever Hans Effect

December 7th, 2007
By Eric Letendre

In the late 1800s, a German high school mathematics instructor named Wilhelm Von Osten began parading around his horse, "Clever Hans".

You see, Clever Hans was no ordinary horse. Clever Hans could add, subtract, multiply, divide, work with fractions, tell time, keep track of the calendar, differentiate musical tones, read, spell, and understand German.

Clever Hans would be asked a question and he would tap his hoof on the ground until he came to the right anwser.

People came from all over to see Clever Hans give the answers to some very difficult math questions.

But some folks were not impressed with Clever Hans. They thought that it was all some kind of trick.

The German board of education agreed and appointed a commission to investigate Hans.

Did Hans really add, subtract, multiply, divide, work with fractions, tell time, keep track of the calendar, differentiate musical tones, and read, spell, and understand German?

The quick answer…NO.

Hans did not know how to do any of the things that his owner claimed. Hans was not a mathematical genius but…

What they learned was that Hans was an expert at reading body language.

The investigators discovered that when a question was asked of Hans, he would start to tap his hoof until he came to the correct anwser.

He knew the correct anwser by watching for cues given by the person asking the questions.

The questioner’s posture and facial expressions changed in ways that were consistent with an increase in tension, which was released when the horse made the final, "correct" tap.

This provided a cue that Hans could use to know when to stop tapping.

In other words, Clever Hans was an expert at reading body language and knew when to stop tapping by the subtle cues given by the person asking Hans a question.

Pretty interesting. Clever Hans really was clever, but not in the way that we thought.

Anyone that lives with a dog should know about this because…

this has lead to what is now called "The Clever Hans Effect."

Social animals, like horses and dogs, become experts at reading our body language. Thisis important to understand when you live with a dog.

Not too long ago I was working with a very nice couple that was having problems with their dog.

They said that their dog knew the sound of their car, became agitated before they left the house, and would become very withdrawn when either one of them became angry.

I explained the Clever Hans Effect and that it has been found that many animals are sensitive to such cues from the humans that they live with.

Their dog was so "tuned in" to them that he knew when they were getting ready to leave, were happy,  upset and a host of other things which in turn affected his behavior.

Today, the term "Clever Hans Effect" is used to describe the influence of a questioner’s subtle and unintentional cues upon their subjects, in both humans and in animals.

For instance, when drug-sniffing dogs undergo training, none of the people present know which containers have drugs in them; otherwise their body language might betray the location and render the exercise useless.

So why am I writing about Clever Hans?

Because your dog is an expert at reading your body language, many times some of the behavior problems you are experiencing are being reinforced though unintentional cues given by you.

JUMPING – How many of you reading this have a jumping problem with your dog? I would wager that a good number of your dogs are jumpers.

How do I know that?

Am I psyhic?

Nope, I just know that after 18+ years of working with dogs, jumping is at the top of the list when it comes to behavior problems and that the main reason it is such a problem is because The Clever Hans Effect is working in full force when it comes to jumping.

In my new Good K9 Manners course, the TTL Method that I outline has to do with this.

http://www.goodk9manners.com/

It’s important to remember that training is more than a clicker, choke collar, or a pat on the head.

Your dog is constantly watching you for some type of cue that may indicate that it’s time to go for a walk, dinner or to jump on you.

If your dog is doing a behavior that you don’t like, pay attention to your cues and see if you are doing anything to reinforce the behavior.

When it comes to dog training the dog is often blamed for bad behavior but sometimes we have to be careful of what we are unintentionally teaching our dogs.

I look forward to your comments.

All the best,

Eric

P.S. You can still get the FREE Good K9 Manners Video Course. It clearly explains how to teach your dog good manners.

Free video dog training and behavior lessons, articles and tips. Go to www.amazingdogtrainingman.com

Eric Letendre is a professional dog trainer from the United States and has been training dogs for over 20 years, teaching regular, average, every-day owners all over the world how to get the training results they want as fast as possible. Eric is also the author of numerous reports, the E-Book “101 Ways to Improve Your Dog’s Behavior,” “The Amazing Dog Training Man Book,” and produced and stars in his DVD “Secrets of a Professional Dog Trainer.”

If you enjoyed this post, I recommend that you join my Dog Hacks Newsletter and receive a FREE copy of my e-book, "101 Ways To Improve Your Dog's Behavior."

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2 Responses to The Clever Hans Effect

  1. Anonymous says:

    Cool blog. You realy helpd me to solve problems with my dog. Thanks!

  2. Anonymous says:

    I love my dogs.I tried to teach them some tricks on your way. They are like new. Thanks!

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Eric LetendreEric Letendre is a professional dog trainer from the United States. For more than 20 years, he has been developing dog training "hacks" that have worked for dog owners all over the world. Eric operates from a home office or a laptop while traveling and draws on his experience and passion for dog training to show others how to develop a dog that is truly “Man’s Best Friend”.

Eric is the author of numerous reports, the E-Book “101 Ways to Hack Your Dog’s Behavior,” “The Amazing Dog Training Man Book,” and produced and stars in his DVD “Secrets of a Professional Dog Trainer.”

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