Implementing psychophysiology in clinical assessments of adolescent social anxiety: use of rater judgments based on graphical representations of psychophysiology

Abstract

Social stressor tasks induce adolescents' social distress as indexed by low-cost psychophysiological methods. Unknown is how to incorporate these methods within clinical assessments. Having assessors judge graphical depictions of psychophysiological data may facilitate detections of data patterns that may be difficult to identify using judgments about numerical depictions of psychophysiological data. Specifically, the Chernoff Face method involves graphically representing data using features on the human face (eyes, nose, mouth, and face shape). This method capitalizes on humans' abilities to discern subtle variations in facial features. Using adolescent heart rate norms and Chernoff Faces, we illustrated a method for implementing psychophysiology within clinical assessments of adolescent social anxiety. Twenty-two clinic-referred adolescents completed a social anxiety self-report and provided psychophysiological data using wireless heart rate monitors during a social stressor task. We graphically represented participants' psychophysiological data and normative adolescent heart rates. For each participant, two undergraduate coders made comparative judgments between the dimensions (eyes, nose, mouth, and face shape) of two Chernoff Faces. One Chernoff Face represented a participant's heart rate within a context (baseline, speech preparation, or speech-giving). The second Chernoff Face represented normative heart rate data matched to the participant's age. Using Chernoff Faces, coders reliably and accurately identified contextual variation in participants' heart rate responses to social stress. Further, adolescents' self-reported social anxiety symptoms predicted Chernoff Face judgments, and judgments could be differentiated by social stress context. Our findings have important implications for implementing psychophysiology within clinical assessments of adolescent social anxiety.

Figure 1

Sample Chernoff Face comparison trial between a patient face (left) and a normative control face (right) based on the baseline data provided in Table 3. For the patient face (left), the underlying mean proportion value for the nose=0.72. For the normative control face (right), the underlying mean proportion value for the nose=0.87.

Figure 2

Sample Chernoff Face comparison trial between a patient face (right) and a normative control face (left) based on the speech preparation data provided in Table 3. For the patient face (right), the underlying mean proportion value for the mouth=0.68. For the normative control face (left), the underlying mean proportion value for the mouth=0.80.

Figure 3

Sample Chernoff Face comparison trial between a patient face (left) and a normative control face (right) based on the speech-giving task data provided in Table 3. For the patient face (left), the underlying mean proportion value for the eyes=0.83. For the normative control face (right), the underlying mean proportion value for the eyes=0.56.