{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20506"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20506","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"\"Effects of decision rule and task importance on sharing of \"\"unique\"\" information\"","abstract":"\"In a recent series of studies Stasser and colleagues have demonstrated that, within task-oriented groups, discussion tends to revolve around those facts which all group members are already aware of. The introduction and thorough consideration of \"\"unique\"\" information, or information that is initially known to only one group member, is minimal. This \"\"Stasser Effect\"\" runs counter to a popular justification for using group rather than individual decision-making units: Groups make use of the broader range of facts (produced by the pooling of individual knowledge sets) available to them. It was hypothesized that two variables held constant across Stasser's studies, decision rule (unanimity) and task importance (low), may actually be contributing to the persistence of the Stasser Effect. Four-person groups made a decision about a campus issue. The decision itself was manipulated to be of either low or high importance. In addition, groups were instructed to be either unanimous, a majority, or had no specific rule assigned them. Results showed that the absence of an assigned rule led to the introduction of significantly greater amounts of unique information. Further, once mentioned, unique information was repeated significantly more often when the decision was of perceived high importance.\"","abstract_html":""In a recent series of studies Stasser and colleagues have demonstrated that, within task-oriented groups, discussion tends to revolve around those facts which all group members are already aware of. The introduction and thorough consideration of ""unique"" information, or information that is initially known to only one group member, is minimal. This ""Stasser Effect"" runs counter to a popular justification for using group rather than individual decision-making units: Groups make use of the broader range of facts (produced by the pooling of individual knowledge sets) available to them. It was hypothesized that two variables held constant across Stasser's studies, decision rule (unanimity) and task importance (low), may actually be contributing to the persistence of the Stasser Effect. Four-person groups made a decision about a campus issue. The decision itself was manipulated to be of either low or high importance. In addition, groups were instructed to be either unanimous, a majority, or had no specific rule assigned them. Results showed that the absence of an assigned rule led to the introduction of significantly greater amounts of unique information. Further, once mentioned, unique information was repeated significantly more often when the decision was of perceived high importance."","abstract_has_math":false,"creators":["Parks, Craig David"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Davis, James H."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:41:11Z","date_published":"2011-05-07T12:41:11Z","updated_at":"2026-07-22T22:25:16Z","subjects":["Psychology, Social","Speech Communication"],"languages":["eng"],"rights":["Copyright 1991 Parks, Craig David"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9136697","(UMI)AAI9136697"],"render_values":[{"text":"AAI9136697","href":null,"code":true},{"text":"(UMI)AAI9136697","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20506","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Davis, James H."]},{"key":"dc:creator","label":"Author","values":["Parks, Craig David"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:41:11Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Psychology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Psychology, Social","Speech Communication"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Parks, Craig David"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9136697","(UMI)AAI9136697","http://hdl.handle.net/2142/20506"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"In a recent series of studies Stasser and colleagues have demonstrated that, within task-oriented groups, discussion tends to revolve around those facts which all group members are already aware of. The introduction and thorough consideration of \"\"unique\"\" information, or information that is initially known to only one group member, is minimal. This \"\"Stasser Effect\"\" runs counter to a popular justification for using group rather than individual decision-making units: Groups make use of the broader range of facts (produced by the pooling of individual knowledge sets) available to them. It was hypothesized that two variables held constant across Stasser's studies, decision rule (unanimity) and task importance (low), may actually be contributing to the persistence of the Stasser Effect. Four-person groups made a decision about a campus issue. The decision itself was manipulated to be of either low or high importance. In addition, groups were instructed to be either unanimous, a majority, or had no specific rule assigned them. Results showed that the absence of an assigned rule led to the introduction of significantly greater amounts of unique information. Further, once mentioned, unique information was repeated significantly more often when the decision was of perceived high importance.\"","Made available in DSpace on 2011-05-07T12:41:11Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9136697.pdf: 2288944 bytes, checksum: b0670b00a3241ed2437f85a0ddd0e764 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:44:21Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:31-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["\"Effects of decision rule and task importance on sharing of \"\"unique\"\" information\""]}]}],"canonical_facts":{"dc:contributor":["Davis, James H."],"dc:creator":["Parks, Craig David"],"dc:date":["2011-05-07T12:41:11Z","10000-01-01","1991"],"dc:description":["\"In a recent series of studies Stasser and colleagues have demonstrated that, within task-oriented groups, discussion tends to revolve around those facts which all group members are already aware of. The introduction and thorough consideration of \"\"unique\"\" information, or information that is initially known to only one group member, is minimal. This \"\"Stasser Effect\"\" runs counter to a popular justification for using group rather than individual decision-making units: Groups make use of the broader range of facts (produced by the pooling of individual knowledge sets) available to them. It was hypothesized that two variables held constant across Stasser's studies, decision rule (unanimity) and task importance (low), may actually be contributing to the persistence of the Stasser Effect. Four-person groups made a decision about a campus issue. The decision itself was manipulated to be of either low or high importance. In addition, groups were instructed to be either unanimous, a majority, or had no specific rule assigned them. Results showed that the absence of an assigned rule led to the introduction of significantly greater amounts of unique information. Further, once mentioned, unique information was repeated significantly more often when the decision was of perceived high importance.\"","Made available in DSpace on 2011-05-07T12:41:11Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9136697.pdf: 2288944 bytes, checksum: b0670b00a3241ed2437f85a0ddd0e764 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:44:21Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:31-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9136697","(UMI)AAI9136697","http://hdl.handle.net/2142/20506"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Parks, Craig David"],"dc:subject":["Psychology, Social","Speech Communication"],"dc:title":["\"Effects of decision rule and task importance on sharing of \"\"unique\"\" information\""],"dc:type":["text"],"thesis:degree_discipline":["Psychology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:16Z"}