An eye tracking index for the salience estimation in visual stimuli

Area of Science:

• Visual attention research
• Health communication
• Psychology of advertising

Background:

• Visual stimuli are crucial for engaging audiences, especially in public service announcements (PSAs).
• Measuring "visual engagement" is key to understanding message effectiveness.
• Existing methods may not adequately quantify the impact of specific visual elements.

Purpose of the Study:

• To propose and validate a novel visual attention (VA) index for quantifying visual engagement.
• To assess the saliency of different areas of interest (AOIs) in antismoking PSAs using the VA index.
• To investigate how visual and textual elements contribute to message effectiveness in young adults.

Main Methods:

• Developed a non-dimensional VA index based on fixation time and area proportions.
• Applied eye-tracking technology to analyze participant responses to antismoking PSA images.
• Defined and analyzed "picture" and "writing" AOIs within selected PSA images.

Main Results:

• The VA index revealed significant differences in attention allocation between visual and textual AOIs.
• For ineffective PSAs, text AOIs received higher VA, suggesting poor message integration.
• Effective PSAs showed higher VA for visual AOIs, indicating stronger engagement with imagery.

Conclusions:

• The VA index is a valuable tool for measuring the saliency of visual stimuli in PSAs.
• Attention to visual elements, rather than text, may correlate with the effectiveness of health-promoting messages.
• Understanding attention patterns can optimize the design of impactful public health campaigns.