Object identification in cerebral visual impairment characterized by gaze behavior and image saliency analysis

Area of Science:

• Neuroscience
• Ophthalmology
• Cognitive Psychology

Background:

• Cerebral visual impairment (CVI) often leads to difficulties in object recognition.
• Individuals with CVI may struggle with abstract or simplified visual stimuli.

Purpose of the Study:

• To investigate object identification abilities in individuals with CVI.
• To explore the impact of image abstraction level on object recognition in CVI.
• To analyze visual search strategies and eye gaze patterns in CVI during object identification.

Main Methods:

• Participants with CVI and neurotypical controls identified common objects across varying image complexities (line drawings to photographs).
• Object identification success rates and reaction times were recorded.
• Eye tracking quantified visual search area, fixations, and gaze pattern alignment with image saliency using Graph-Based Visual Saliency (GBVS).

Main Results:

• CVI participants exhibited lower success rates and longer reaction times compared to controls.
• Identification accuracy improved with image realism (photographs vs. abstract drawings) in the CVI group.
• CVI participants displayed wider visual search areas and more fixations, with less alignment between gaze patterns and image saliency.

Conclusions:

• Object form and color are crucial for object identification in individuals with CVI.
• Altered visual search strategies and reduced saliency-based gaze patterns characterize CVI.
• Findings inform interventions for visual perceptual deficits in CVI.