Using fMRI Representations of Single Objects to Predict Multiple Objects in Working Memory in Human Occipitotemporal...

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Neural responses in sensory areas often average when multiple objects are perceived.
• It remains unclear if this averaging principle extends to representations held in visual working memory (VWM).

Purpose of the Study:

• To investigate whether neural representations in VWM exhibit a similar averaging property as observed in visual perception.
• To determine if response averaging applies to representations formed and maintained in VWM.

Main Methods:

• Utilized functional magnetic resonance imaging (fMRI) to examine brain activity patterns in human participants.
• Designed two experiments to analyze neural response averaging across different VWM loads.
• Accounted for task-specific factors like memory load to isolate the averaging effect.

Main Results:

• Confirmed that VWM representations exhibit a linear averaging relationship, mirroring findings in perception.
• Observed this averaging in key brain regions including the occipitotemporal cortex and posterior parietal cortex.
• Demonstrated that averaging occurs even with lower neural response amplitudes in VWM compared to perception.

Conclusions:

• The linear averaging of neural representations is a fundamental property extending from perception to VWM.
• Response averaging in VWM likely serves to minimize interference and maintain representational independence between stored items.
• Response averaging presents a valuable methodological tool for probing neural independence beyond perception and VWM.