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Updated: Jun 5, 2026
Short-Term Free-Floating Slice Cultures from the Adult Human Brain
Published on: November 5, 2019
Slicing it thin: new methods for brief sampling analysis using RIAS-coded medical dialogue
Debra L Roter1, Judith A Hall, Danielle Blanch-Hartigan
1Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior and Society, Baltimore, MD, USA. droter@jhsph.edu
Objective:
To explore the relationship between one-minute slices and full-session interaction and the predictive validity of the slices to ratings of affect and rapport.
Methods:
Third-year medical students (n=253) were videotaped during an OSCE. All interaction was coded using the Roter Interaction Analysis System (RIAS) and samples were drawn at minutes 1, 5, and 9 and extracted from the coded database. The slices were related in multivariate analysis to full-session interaction, corrected for slice content, and correlated with affect ratings of participants and independently rated judgments of rapport.
Results:
One-minute slices explained 33% of full-session variance in student interaction and 30% of variance in standardized patient interaction. Slices were significantly correlated with affective ratings of participants and independent judgments of rapport in a similar pattern as full-session interaction analysis.
Conclusions:
One-minute slices of interaction can provide a meaningful degree of insight into OSCE session communication with both concurrent and predictive validity to ratings of session affect and rapport.
Practice Implications:
Evidence of concurrent and predictive validity further supports use of this approach as a research tool that provides an efficient means of analyzing processes of care, examining variation in communication throughout a visit and predicting visit outcomes.
