Implicit encoding of extrinsic object properties in stored representations mediating recognition: evidence from...

Area of Science:

• Cognitive Psychology
• Computational Neuroscience
• Computer Vision

Background:

• Object recognition relies on stored representations of visual properties.
• The role of extrinsic properties like shadows in object recognition is not fully understood.
• Viewing conditions, such as lighting and shadows, can influence object perception.

Purpose of the Study:

• To investigate if stored shape representations in object recognition encode extrinsic properties like cast shadows.
• To determine the conditions under which cast shadows influence object recognition.
• To examine how object recognition binds shape with shadow information.

Main Methods:

• 90 observers memorized novel 3D objects rendered with different shadow conditions (no shadow, internal shadow, internal and external shadow).
• Object recognition was tested using masked primes with matching or mismatching shadow conditions across learned and novel views.
• Priming effects were measured to assess the influence of shadow rendering on recognition.

Main Results:

• Objects memorized with internal shadow showed a recognition advantage.
• Internal shadow primes led to stronger priming compared to no shadow or full shadow conditions.
• Priming effects generalized to novel views, indicating robust encoding of shadow information.

Conclusions:

• Stored shape representations in object recognition can bind with extrinsic properties like cast shadow.
• This binding occurs when cast shadow cannot be discounted due to ambiguous scene lighting cues.
• The findings suggest a more integrated representation of object shape and its interaction with light in the environment.