DOI: 10.3886/e192761v1
title: Applyi ng Text Analysis to Evaluate the Common Knowledge Effect on Discussion

description: This study aimed to examine the appropriateness of text
analysis in an experimental study to ascertain the common knowledge effect on
the discussion process. Two mock jury experiments were conducted wherein 204
participants were given information about a fictitious murder case and made
group decisions in 4-person discussion groups, choosing from verdicts of “guilty”,
“not guilty”, and “presumed innocent”. Experiment 1 set conditions using the
information distributed to each group member. Latent
Dirichlet allocation topic model was conducted to explore topics in
chatlogs that would be influenced by the information allocated to each member.
ANOVA revealed that the experimental conditions, “sharing (high/low) ×
information (alibi/dummy)” had effects on topic ratios. Experiment 2
investigated false memory related to the topics identified in Experiment 1. The
results of the Deese, Roediger, and McDermott experiments conducted pre and post-discussion revealed that
false memories increased post-discussion[A1] . Mediation analysis suggested that a certain topic ratio
correlated with false memory, whereas the number of words used during the discussion
decreased false memory. Using text analysis, the present study showed how information
allocated beforehand influences the course of the discussion process, and that
group discussions leave traces in individual’s knowledge structures.











 [A1]Test
results and significance values need not be presented in the abstract. 











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