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Exemplification theory is a theory that states that an event is the exemplification of a property in an entity. This identity is often modeled as an "ordered triple" of an entity, property type, and time).〔Hendrickson, N. (2006, May 15). Towards a More Plausible Exemplification Theory of Events. Philosophical Studies, 129(2), 349-375.〕 Much of exemplification theory is based on logic arguing that there are evolutionary advantages that stem from the ability to group events together. Humans do this by sifting through experiences to group those that seem to go together and coding the occurrence of events in a quantitative manner that allows them to make judgments (most often nonconsciously) of how frequently different events occur.〔Zillmann, D. (2000). Mood management in the context of selective exposure theory. In M. Roloff (Ed.), Communication Yearkbook 23 (pp. 103-123). Thousand Oaks: Sage Publications, Inc.〕 These judgments are considered based on two cognitive devices: the availability heuristic and the representativeness heuristic. The availability heuristic tells us that judgments of social phenomena are greatly influenced by the ease with which information comes to mind.〔Gibson, R. & Zillmann, D. (1998). Effects of citation in exemplifying testimony on issue perception. Journalism & Mass Communication Quarterly, 75, 1, 167-176.〕 Availability heuristics can be a useful tool for assessing frequency or probability of an event.〔Rothbart, M., Fulero, S., Jensen, C., Howard, J., & Birrell, P. (1978). From individual to group impressions: Availability heuristics in stereotype formation. Journal of Experimental Social Psychology, 14, 237-255.〕 Individuals that employ the availability heuristic evaluate the frequency of events based on the quickness with which pertinent instances come to mind.〔Zillmann, D., Gibson, R., Sundar, S.S., & Perkins, J.W. (1996). Effects of exemplification in news reports on the perception of social issues. Journalism and Mass Communication Quarterly, 73, 2, 427.〕 The representativeness heuristic is a special case of availability. It stipulates that abstract base-rate information plays little role in quantitative judgments about event populations. Instead, these judgments are based on the sample of more concrete exemplars that are available to the individual at the time of decision making. Exemplification theory is a simple combination of these heuristics. It posits that since exemplars come to mind more easily than base-rates when accessing information, available exemplars will dominate base-rate information when making judgments of event populations.〔Worrell, T.R. & Tamborini R. (2009). The TV made me do it: The impact of exemplars and base- rates on behavioral intentions. A paper presented at the 95th meeting of the National Communication Association, Chicago, IL.〕 Behavioral intentions are the direct determinants of behaviors.〔Ajzen, I. & Fishbein, M. (1980). Understanding attitudes and predicting social behavior. Englewood Cliffs, NJ: Prentice Hall.〕 Much of this research focuses on the manipulation of attitudes, subjective norms, and/or behavioral control with the message having a direct impact on receivers based on the information provided and the presentation of base-rates and exemplars. Exemplification theory examines the role of base-rates and exemplars in communication messages.〔Zillmann, D. (2002). Exemplification theory of media influence. In J. Bryant & D. Zillmann (Eds.), Media effects: Advances in theory and research (pp. 19-41). Mahwah, NJ: Lawrence Erlbaum Associates.〕 Individuals pay attention to (and are more influenced by) exemplars than by base-rate data.〔 Base-rates are not always inconsequential.〔 Criticism in the 1980s rejected exemplificationism, charging that it ultimately conflates events with facts.〔10. Bennett, J. (1988): Events and Their Names. Hackett Publishing Company. Goldman, A. (1970): A Theory of Human Action. Prentice Hall.〕〔Lombard, L. (1986): Events: A Metaphysical Study. Routledge & Kegan Paul.〕 Since then, exemplificationism has lost almost all of its previous popularity. == Exemplars and base-rates == An exemplar is an instance of an event population that shares essential features with all other instances from the group of events that is defined by those features. In a sense, exemplars are case reports used to represent characteristics typical of a group of event.〔12. Zillmann, D. & Brosius, H.B. (2000). Exemplification in Communication: The influence of case reports on the perception of issues. Mahwah, NJ: Lawrence Erlbaum Associates.〕 Commonly, exemplars are illustrative representations of information. An exemplar will provide a demonstration of an event. Exemplars used in conjunction with base-rates as case illustrations of event populations to enhance or detract from given base-rate information as the salient features of the exemplar are representative of the event population.〔Brosius, H.B. & Bathelt, A. (1994). The utility of exemplars in persuasive communications. Communication Research, 21, 1, 48-79.〕 As with news reports, exemplars are often added to provide a description of an event being discussed within a report and are chosen for their entertaining qualities.〔Gibson, R. & Zillmann, D. (1994). Exaggerated versus representative exemplification in news reports. Communication Research, 21, 5, 603-625.〕 Base-rates present descriptions limited to certain general features of the event population. Base-rate information often comes in the form of a numerical representation such as the frequency with which an event occurs. Typically it is thought of as quantitative information about population events 〔Zillmann, D. & Brosius, H.B. (2000). Exemplification in Communication: The influence of case reports on the perception of issues. Mahwah, NJ: Lawrence Erlbaum Associates.〕 or a general description of the number of things or people in the setting.〔 Base-rates are said to be less illustrative or vivid than exemplar information. They have not been examined as often as exemplars.〔Koehler, J.J. (1996). The base rate fallacy reconsidered: descriptive, normative, and methodological challenges. Behavioral and Brain Sciences, 19, 1, 1-54.〕 They are overwhelmed by exemplars in many circumstances,〔Berger, C.R. (2000). Quantitative depictions of threatening phenomena in news reports: The scary world of frequency data. Human Communication Research, 26, 1, 27-52.〕 it does not appear that they are always ignored. Prior investigations suggest that base-rates are perceived by decision makers as more reliable and can influence decisional confidence more than exemplars.〔Adler, J.E. (1997). If the base rate fallacy is a fallacy, does it matter how frequently it is committed? Behavioral and Brain Sciences, 20, 4, 774-776.〕 Base-rates are perceived as more truthful,〔 precise,〔 and accurate〔Zillmann, D., Perkins, J.W., & Sundar, S.S. (1992). Impression formation effects of printed news varying in descriptive precision and exemplification. Medienpsychologie, 4, 168-185.〕 than exemplars. Nevertheless, recent research has shown that exemplification effects are prone to other perceptual phenomena.〔Scherr, S., Müller, P., & Fast, V. (2013). Do third-person perceptions amplify exemplification effects? International Journal of Communication, 7, 1603-1621.〕 Some research suggests several disadvantages to the use of exemplars, particularly in relation to perceptual bias that might result from their use. Exemplars are also said to play a role in perpetuating negative stereotypes, and in isolation are frequently found to be inefficient sources of information.〔Sherman, J.W. (1996). Development and mental representation of stereotypes. Journal of Personality and Social Psychology, 70, 6, 1126-1142. 〕 Exemplar information has largely been found to be less reliable than base-rate information. In part, because it is seldom collected or presented in a systematic manner.〔 Exemplification research demonstrates that individuals often base their assessment of social reality more strongly on attributes of the exemplars selected for inclusion in media reports than statistical representations of information. This has been found problematic when the exemplar is atypical and chosen for its entertaining or sensational qualities, a common occurrence within news stories. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Exemplification theory」の詳細全文を読む スポンサード リンク
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