Memory systems
How does the brain build mental scenes step-by-step?
Open access · cc by · source: Europe PMC
Creating a mental image of a scene step-by-step activates different parts of the brain at different times, rather than using one single, continuous process.
Key findings
They discovered that imagining the first element activated both the object-processing network and parts of the core scene network. Adding the second element temporarily deactivated these core areas, but adding a third element reactivated them, marking the point where participants achieved a coherent scene. Beyond 3 elements, adding more details did not further increase activation in the core network.
Methodology
The researchers scanned nineteen healthy participants using a 1.5 tesla MRI machine while they built mental scenes. Participants listened to auditory descriptions and imagined indoor scenes step-by-step by adding 3, 4, 5, or 6 sequential elements. They also performed matched control trials to control for memory load and attention, rating their imagination after each run.
Limitations
The study did not establish a causal relationship because functional imaging is correlational. Furthermore, the small sample of nineteen young, healthy individuals might not represent how older adults or individuals with clinical brain damage construct scenes.
How this study connects
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