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====Experiments====
Two separate experiments were conducted to support the model proposed by Smith, Shoben, & Rips, 1974. The first experiment tested category size in determining semantic decisions and the second experiment was called the Instance-Category Verification Experiment. To begin, the first experiment, the statement “An S is a P” is typed onto two different cards. One card for the instance and smaller category and the other card are for the instance and the larger category. All 52 true statements are randomized with 52 false statements by pairing instances and categories from different triples. The instance-category pairs were then presented individually to a subject for rapid verification. In the second experiment, subjects are presented a set of instance-category pairs (Several instances were used for each category) and then were asked to rate the typicality of each instance to its associated category. In the both experiments, the Featural Model for Semantic Representation quantifies its findings by making the value, x, is equal to the overall similarity between the instance and the target category. The x value determines whether the participants execute a fast reaction time in both true and false response. True responses are (x>c1) and False responses are (x<c1). When the participants are having a difficult time determining the similarity between the instance and the target category, (co<x<c1), the second stage of the semantic feature model is entered; which focuses more on the defining features of the instance and the target category. Four expressions where derived to quantify the probability of each error type and to express correct true and correct false reaction times. 30 young adults from Stanford University were the subjects in both studies[1].
===Michael Posner Experiment (1986 at the University of Oregon)===
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