Perceptual asymmetries in greyscales: object-based versus space-based influences

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Individuals exhibit leftward spatial biases, influenced by object- and space-based factors.
• The precise contributions of these biases and their interaction with spatial location are not fully understood.

Purpose of the Study:

• To investigate the influence of relative position on spatial biases using greyscale images.
• To examine if object-based biases are amplified with actual objects and directional lighting.
• To determine how visual field location and stimulus type modulate spatial biases.

Main Methods:

• Study 1: Greyscale task with shifted images to assess object- and space-based biases and relative position effects.
• Study 2: Used objects with congruent/incongruent directional lighting to evaluate object-based bias strength.
• Analysis focused on visual field (left/right/lower) and stimulus proximity.

Main Results:

• A left object-based bias was observed in the right visual field, moderated by a central bias.
• Lower visual field images showed a significant left bias in the left visual field.
• Object-based biases were stronger with actual objects, with leftward bias in congruent and rightward in incongruent lighting conditions.
• Lower visual field bias interacted with other biases, sometimes eliminating the leftward bias.

Conclusions:

• Both object- and space-based biases contribute to spatial perception.
• Stimulus type influences the dominance of either space- or object-based biases.
• Spatial location, particularly the visual field, critically interacts with reference frames to determine the strength and direction of leftward bias.