Visual perceptual learning is enhanced by training in the illusory far space

Area of Science:

• Neuroscience
• Cognitive Psychology
• Visual Perception

Background:

• Visual stimuli in near peripersonal space (PPS) are typically processed faster than those in the far extrapersonal space (EPS).
• This suggests a preferential processing advantage for stimuli closer to the body.
• However, recent studies indicate larger perceptual learning in far space, contradicting this advantage.

Purpose of the Study:

• To investigate the differential effects of visual training in PPS versus EPS.
• To determine if the location of training (near vs. far) influences visual perceptual learning.
• To explore the role of depth and hemispace in visual learning.

Main Methods:

• Two laboratory experiments using the horizontal Ponzo Illusion to create depth perspective.
• Participants performed a visual search task (target orientation detection) before and after 1 hour of training.
• Training occurred in either illusory near or far space, with experiments varying hemispace (left vs. right).

Main Results:

• Visual perceptual learning was significantly greater after training in the far space compared to the near space.
• Training in near space resulted in improvements in far space (Experiment 1) or no change (Experiment 2).
• Greater visual perceptual learning was observed when stimuli were presented in the left hemispace versus the right.

Conclusions:

• Contrary to visual processing speed, visual perceptual learning is more effective in the far space.
• Depth is a crucial dimension for enhancing human visual learning.
• Hemispatial differences may also influence the effectiveness of visual perceptual learning.