Category-specific activations depend on imaging mode, task demand, and stimuli modality: An ALE meta-analysis

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• The cortical organization of the semantic network is extensively studied but remains controversial.
• Consistent patterns of category-specific brain activations and influencing factors require systematic investigation.

Purpose of the Study:

• To comprehensively review and synthesize neuroimaging findings on category-specific semantic activations.
• To identify consistent brain regions for living versus nonliving concepts.
• To examine how methodological factors influence these activations.

Main Methods:

• Systematic literature review of 113 published neuroimaging studies from the past two decades.
• Utilized the Activation Likelihood Estimate (ALE) meta-analysis method.
• Analyzed studies reporting category-specific activations for living or nonliving concepts.

Main Results:

• Characterized consistent brain regions associated with living and nonliving concepts.
• Revealed significant influence of methodological factors (imaging mode, task, stimuli) on activation patterns.
• Demonstrated that semantic activation patterns are highly contextually dependent.

Conclusions:

• Provides the most comprehensive summary to date of category-specific semantic activations.
• Highlights the critical role of context and methodology in shaping observed brain patterns.
• Offers insights into the organization of the cortical semantic network and future research.