Token economy

Token economy
Intervention
ICD-9-CM	94.33
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A token economy is a system of contingency management based on the systematic reinforcement of target behavior. The reinforcers are symbols or "tokens" that can be exchanged for other reinforcers. A token economy is based on the principles of operant conditioning and behavioral economics and can be situated within applied behavior analysis. In applied settings token economies are used with children and adults; however, they have been successfully modeled with pigeons in lab settings.

Three requirements are basic for a token economy.

Tokens must be used as reinforcers to be effective. A token is an object or symbol that can be exchanged for material reinforcers, services, or privileges (back-up reinforcers). In applied settings, a wide range of tokens have been used: coins, checkmarks, images of small suns, points on a counter. These symbols and objects are comparably worthless outside of the patient-clinician relationship, but their value lies in the fact that they can be exchanged for other things. Technically speaking, tokens are not primary reinforcers, but secondary or learned reinforcers. Much research has been conducted on token reinforcement, including animal studies.

Tokens have no intrinsic value, but can be exchanged for other valued reinforcing events: back-up reinforcers. Most token economies offer a choice of differing back-up reinforcers that can be virtually anything. Some possible reinforcers might be:

Back-up reinforcers are chosen in function of the individual or group for which the token economy is set up, or depending upon the possibilities available to the staff. Prior to starting the staff decides how many tokens have to be paid for each back-up reinforcer. Often, price lists are exposed or given to the clients. Some back-up reinforcers can be bought anytime, for other exchange times are limited (e.g. opening times of a token shop).

There is a broad range of possible target behaviors: self-care, attending activities, academic behavior, disruptive behavior. A token economy is more than just using exchangeable tokens. For a token economy to work, criteria have to be specified and clear. A staff member giving tokens to a client just because he judges he is behaving positively, is not part of a token economy because it is not done in a systematic way. Sometimes client manuals have specifications how many tokens can be earned by each target behavior. For instance, if making the bed is a target behavior, staff and clients have to know how a well-made bed looks like: do the sheets have to be put under the mattress, cushion on top? However, often these specifications are hard to make: behavior such as eating politely and positive cooperation are hard to specify. While planning how many tokens can be earned by each target behavior some factors have to be considered: on the one hand clients should be able to earn a minimal amount of tokens for a minimal effort, and on the other hand clients should not earn too much too soon, making more effort useless.
Sometimes the possibility of punishment by token loss is included, technically called 'response cost': disruptive behavior can be fined with the loss of tokens. This also should be clearly specified before the application starts. Clients can be involved in the specifying of the contingencies.

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