Typicality is usually defined as the degree to which an instance is agood example of a category (Rosch & Mervis, 1975). It has been shownthat typicality is related to many important categorization phenomena.Typical members are more quickly judged to be category members(e.g., an apple is more quickly judged to be a member of the fruit categorythan is a kiwi), are more likely to be used as the basis of inductiveinference (Osherson, Smith, Wilkie, Lopez, & Shafir, 1990; Rips,19751, and are generated sooner in response to a category probe thanare atypical members (Mervis & Rosch, 1981). In addition, typicality isrelated to the probability that an object will be judged to be a categorymember. For example, Rips, Shoben, and Smith (1973) showed that errorrates for categorization were negatively related to typicality. Furthermore,extremely atypical instances are less likely to even becategorized as a member of a category (see Smith & Medin, 1981). Acouch is a typical member of the category furniture; therefore, it is extremelylikely to be categorized as such. A lamp, on the other hand, isquite an atypical member of furniture and is much less likely to be categorizedas one. These findings suggest that an increase in typicalityas a member of a given category for an ambiguous product can be seenas an increase in the probability that it will be categorized accordingly.