Salient objects dominate the central fixation bias when orienting toward images

Area of Science:

• Cognitive Psychology
• Neuroscience
• Computer Vision

Background:

• Short-latency saccades in visual search are influenced by image salience and central fixation tendencies.
• Understanding these biases is crucial for fields like human-computer interaction and artificial intelligence.

Purpose of the Study:

• To quantify the interplay between salient object bias and central fixation bias in visual selection.
• To investigate the influence of image-background contrast on central fixation bias.

Main Methods:

• Participants performed saccadic eye movements to images with varying salient object locations and instructed fixation points.
• Image-monitor contrast was manipulated to assess its effect on visual orienting and central bias.

Main Results:

• An early, involuntary bias toward the image center was observed, regardless of strategic control or object presence.
• The bias towards salient objects eventually outweighed the central bias when they competed.
• Image-monitor contrast reduction decreased central bias during exploration, particularly for images lacking salient objects.

Conclusions:

• Visual search exhibits a dual bias system: an initial central pull and a later, stronger pull towards salient stimuli.
• Image-background segregation plays a role in modulating central fixation tendencies during visual exploration.