Default mode
How does the brain make decisions without sensory input?
Open access · cc by · source: Europe PMC
The default mode network helps us make decisions using complex concepts retrieved from memory rather than what we see in front of us.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Rather than being purely passive, regions within the DMN actively support memory-guided, conceptually complex decisions and semantic processing over simple sensory matching.
Evidence for the claim as stated.
The angular gyrus, as a part of the default mode network, supports perceptually-decoupled cognition by helping individuals make decisions based on complex concepts retrieved from memory rather than immediate sensory inputs.
Evidence for the claim as stated.
Study at a glance
- Design
- Human experiment — fMRI of default-mode regions distant from sensory input
- N
- N=29 · 30 University of York students; 1 excluded for motion; 16 women; ages 18–34
- Population
- Right-handed native British-speaking young adults
- Outcome
- Default-mode regional responses as a function of distance from sensory input
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How does the brain make decisions without sensory input?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
twenty-nine subjects
One participant's data was excluded due to excessive motion artefacts, leaving twenty-nine subjects in the final analysis for (15 female; mean age 22.57, range 18–24 years).
four conditions
The task paradigm had four conditions: (A) Object 0-back, (B) Object 1-back, (C) Colour 0-back and (D) Colour 1-back using a block design.
Key findings
The study revealed that the default mode network, particularly the bilateral angular gyrus and the left middle temporal gyrus, was highly active during memory-driven, conceptually complex decisions. Additionally, the entire brain's activity shifted away from sensory processing regions toward transmodal networks when participants had to retrieve complex object concepts from memory.
Methodology
The researchers analyzed functional magnetic resonance imaging data from twenty-nine subjects during a matching task. The experiment involved four conditions that crossed memory demands with stimulus complexity. The task compared decisions based on either simple colors or complex real-world objects, and tested whether the target information was currently visible on the screen or had to be recalled.
Limitations
The study cannot determine which specific characteristics of conceptual retrieval drive this brain activity. It also cannot distinguish whether the observed activity represents retrieving the correct memory or actively suppressing irrelevant memories. Finally, the research is correlational and cannot prove that these default mode network regions are causally required for these cognitive tasks.
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