Multivoxel Object Representations in Adult Human Visual Cortex Are Flexible: An Associative Learning Study

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Associative learning is crucial for understanding the environment.
• Medial-temporal lobe structures are vital for associative learning.
• The role of the ventral visual pathway (VVP) in associative learning remains unclear.

Purpose of the Study:

• To investigate whether multivoxel object representations in the VVP reflect newly formed associations.
• To determine if the VVP's object representations change after learning arbitrary associations between object categories.

Main Methods:

• Participants underwent fMRI scanning before and after 15 days of associative learning.
• A classifier was used to assess changes in multivoxel object representations in the VVP.
• Behavioral priming experiments were conducted months later to assess long-lasting effects.

Main Results:

• Ventral visual pathway (VVP) multivoxel representations became more similar after participants learned arbitrary object associations.
• Cross-classification performance increased in the VVP (average 3.3%), but not in the hippocampus.
• Learned associations had long-lasting perceptual consequences, correlating with behavioral priming.

Conclusions:

• Multivoxel object representations in the VVP are dynamic and change following associative learning.
• The VVP plays a significant role in representing learned associations between objects.
• These representational changes in the VVP are linked to lasting perceptual effects.