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Interviewing eyewitnesses: Enhancing outputs by controlling the grain size of reports

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Abstract:

We investigated an interviewing protocol designed to increase outputs while diagnosing accuracy. We contrasted a free recall and a Self-Administered Interview (Gabbert, Hope, & Fisher, 2009) with a Grain Size interview protocol which ‘forced’ witnesses to (a) answer all questions at several different levels of detail (grain size), and (b) provide confidence judgments for responses at each grain size. When confidence levels were high, the Grain Size procedure markedly increased output quantity for coarse grain information, without any significant decrement in accuracy. At high confidence levels, fine and preferred grain outputs also exceeded free recall, without accuracy loss.
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Association:
Name: American Psychology - Law Society
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http://www.ap-ls.org/


Citation:
URL: http://citation.allacademic.com/meta/p399082_index.html
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MLA Citation:

Brewer, Neil., Muller, Tamara., Nagesh, Ambika., HOPE, LORRAINE. and Gabbert, Fiona. "Interviewing eyewitnesses: Enhancing outputs by controlling the grain size of reports" Paper presented at the annual meeting of the American Psychology - Law Society, Westin Bayshore Hotel, Vancouver, BC, Canada, <Not Available>. 2014-11-28 <http://citation.allacademic.com/meta/p399082_index.html>

APA Citation:

Brewer, N. , Muller, T. , Nagesh, A. , HOPE, L. and Gabbert, F. "Interviewing eyewitnesses: Enhancing outputs by controlling the grain size of reports" Paper presented at the annual meeting of the American Psychology - Law Society, Westin Bayshore Hotel, Vancouver, BC, Canada <Not Available>. 2014-11-28 from http://citation.allacademic.com/meta/p399082_index.html

Publication Type: Symposium Paper
Abstract: We investigated an interviewing protocol designed to increase outputs while diagnosing accuracy. We contrasted a free recall and a Self-Administered Interview (Gabbert, Hope, & Fisher, 2009) with a Grain Size interview protocol which ‘forced’ witnesses to (a) answer all questions at several different levels of detail (grain size), and (b) provide confidence judgments for responses at each grain size. When confidence levels were high, the Grain Size procedure markedly increased output quantity for coarse grain information, without any significant decrement in accuracy. At high confidence levels, fine and preferred grain outputs also exceeded free recall, without accuracy loss.


Similar Titles:
“I’m Anxious About the Interview” Does Rapport Building Decrease Pre-Interview Anxiety and Enhance the Quality of Eyewitness Reports?

How Accurate are Interviewers’ Recollections of Investigative Interviews: Examining Omissions from Interview to Report.

The effects of witnesses’ regulation of grain size and report option on the confidence-accuracy relationship


 
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