Setup & Apparatus

The stimuli images were presented on an 28” monitor with a screen resolution of 1920 x 1980 pixels and a refresh rate of 60 Hz. Eye tracking responses were measured using a Gazepoint GP3HD V2 Eye tracker.

The facial responses were measured using a Cisco Precision HD F1.7/50 Degree View Camera. iMotions eye tracking software was used to present and record the eye-movement.

Eye Tracking and Facial Expression Analysis were two objective measures used in the study.

Examples of sample Cannabis Package labels viewed by participants in both Phase 1 and Phase 2.

Independent variables:

Cannabis label warning presentation (Original, bullet points, symbols)

Potency presentation (Traffic light, THC %, or MG)

Potency indicated on the label (high or low) 

Phase 2: Comprehension Accuracy Test

Phase 2 of the study was a 3 x 3 x 2 factorial within-subjects full factorial design study where each participant experienced 18 conditions each.


The accuracy of the responses collected from the participants in the quiz section were coded with either a ‘1’ which indicated a correct response or ‘0’ which indicated an incorrect response.

Each image of a label they viewed was followed by two questions: 

“Is this a low, medium, or high dose?”

Low

Medium

High

“The Cannabis Government Warning Label (the bottom section of the packaging) is easy to understand”

Strongly Agree

Agree

Neutral

Disagree

Strongly Disagree

PREFERRED THC%

5/24

PREFERRED TRAFFIC LIGHT

Traffic light notation is a subjective grading system - high potency for one person could be another person’s low potency.