There is a huge misunderstanding about the word ‘pressure’ in the horse world. I hear people who want to start positive reinforcement training but they hesitate: ‘How can I start clicker training my horse and don’t use any pressure? Isn’t that impossible?’ Yes, training a horse without pressure is impossible, but let me explain the difference between using pressure as cue and using pressure as reinforcer.
Let’s discuss some definitions before I debunk the myth that +R trainers don’t use pressure.
What is ‘pressure’ according to the Cambridge Academic Content Dictionary:
Pressure (force): the force produced by pressing against something: air/blood/water pressure. Pressure is also the force that is put on a surface with reference to the area of the surface.
Pressure is per definition not ‘bad’. Pressure can be ‘unpleasant’, ‘neutral’ or ‘pleasant’. It can also happen that the association with pressure changes due to the horses training.
Examples of pressure that feel good are mutual grooming, rubbing against a fence or horses that are playfully pushing each other. Pressure that is aversive can be a kick or a bite or being chased away from the herd. Pressure can also be neutral in the beginning:it doesn’t give the horse a good or a bad feeling.
I have trained horses with NH and traditional methods in the past. These methods use pressure as an aversive. Some horses don’t experience pressure as an aversive that they naturally want to avoid. Some horses (especially Fjorden horses, Halfingers and Friesians I worked with) need really strong pressure in order to learn to yield.
Negative reinforcement (-R): A behaviour is strengthened by removing an unpleasant or painful (=aversive) stimulus.
Natural horsemanship & traditional training
In natural horsemanship and traditional methods it is this ‘pressure’ that makes the horse yield.
In traditional and natural horsemanship methods pressure is used in an accumulating way until it is aversive enough for the horse to yield. Then the pressure is released in order to make the wanted behaviour stronger.
For instance when a horse doesn’t respond to a light pressure of the riders legs (calf) to go forward, the rider builds up the pressure by squeezing harder or using his spurs. If that doesn’t work the leg aid is followed by a tap with the whip (which can be painful, try it on your own skin).
In this way the trainer teaches the horse to anticipate on the riders light leg aids. If the light leg aid isn’t aversive in the first place it is followed by more pressure until the horse moves forward. The light pressure of the leg becomes an aversive in itself: the horse has learned to associate the leg aid with an aversive to which he wants to anticipate with yielding. Which isn’t the case at all in positive reinforcement training.
Positive reinforcement (+R): A behaviour is strengthened by adding a pleasant (=appetitive) stimulus.
Positive reinforcement (clicker) training
In positive reinforcement training the desired behaviour is trained first. Only if the behaviour is established, a cue is added. The cue can be anything.
So in positive reinforcement training the trainer will teach the horse to move forward first and will use appetitives to reinforce the forward movement. The trainer can induce the forward movement in different ways, according to the situation (capturing, targeting, shaping or luring or moulding*). There is no use of pressure yet.
After the behaviour is established you add the cue. The behaviour already has a strong positive reinforcement history (going forward is strongly associated with pleasurable rewards). If the cue ‘light pressure of the calf’ is added to the forward movement, the rider is using pressure.
The pressure cue is only chosen if it is not aversive. If the leg pressure is considered aversive the trainer will either choose a different cue or can choose to counter condition the pressure cue first and make it neutral or change it to a pleasurable sensation before using it.
This cue will always has the same amount of pressure. If the horse isn’t responding to it, the pressure will not be accumulated. Why not? Because this changes the cue and therefor will not be understood by the horse (stronger leg pressure or a tap with the whip is not associated with going forward).
Differences in using pressure in -R &+R
In -R the pressure is used to teach a horse behaviours. The pressure is released to make the behaviour stronger. Therefore the pressure is associated with an aversive stimulus. If the cue wasn’t aversive, the horse wouldn’t have learned to yield/anticipate to it.
In +R the pressure cue is added only after the behaviour is established with pleasurable stimuli. The pressure is therefor not associated with an aversive. The pressure cue that is chosen is not aversive in itself and it is trained with appetitives.
Behaviours that are trained with pressure and release and then rewarded with a treat or scratch at the end, are not considered positive reinforcement.
Pressure can be aversive, neutral or appetitive.
It is the trainers responsibility to turn a neutral pressure or aversive pressure cue in a way that it is useful for communication and becomes appetitive (associated with something pleasurable). That can only be achieved with positive reinforcement, not with traditional or natural horsemanship methods.
My goal is not to avoid pressure, my goal is to understand what association the horse has with pressure and make it a pleasurable way to communicate.
*) Attention! With moulding behaviour pressure is used, but it is never aversive. If the pressure in moulding turns aversive it is not moulding anymore, but forcing a behaviour.
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