Dynamic functional connectivity in the right temporoparietal junction captures variations in male autistic trait expression.
Reduced dynamic connectivity in the right temporoparietal junction tracks autistic trait severity in adults, offering a potential neural biomarker.
01Research in Context
What this study did
Bravo Balsa et al. (2024) scanned adults with and without autism. They watched how the right temporoparietal junction talked to itself over time.
The team used dynamic fMRI. They tracked tiny shifts in connectivity while people lay still.
What they found
Adults with autism showed fewer switches between strong and weak connection states in this brain area.
Lower switching predicted higher SRS scores. The same link showed up in two separate data sets.
How this fits with other research
Tu et al. (2016) found thicker cortex and altered ACC links when teens scored high on the same SRS scale. Laura moves the story forward by showing the trait leaves a real-time signature in adults.
Damarla et al. (2010) first spotted 'underconnectivity' with static scans during a puzzle task. Laura adds motion pictures: the wires wobble even when the brain is at rest.
Kotila et al. (2021) also used dynamic fMRI, but focused on default-mode timing. Together the papers say autism is not just 'less wiring'; it is wiring that cannot settle into the next gear.
Why it matters
You now have a neural speedometer. If an adult client shows big swings in SRS scores across weeks, the rTPJ metric may help explain why. It also gives you a concrete biomarker to share with neurologists when families ask, 'Is this real in the brain?'
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02At a glance
03Original abstract
Autistic individuals can experience difficulties with attention reorienting and Theory of Mind (ToM), which are closely associated with anterior and posterior subdivisions of the right temporoparietal junction. While the link between these processes remains unclear, it is likely subserved by a dynamic crosstalk between these two subdivisions. We, therefore, examined the dynamic functional connectivity (dFC) between the anterior and posterior temporoparietal junction, as a biological marker of attention and ToM, to test its contribution to the manifestation of autistic trait expression in Autism Spectrum Condition (ASC). Two studies were conducted, exploratory (14 ASC, 15 TD) and replication (29 ASC, 29 TD), using resting-state fMRI data and the Social Responsiveness Scale (SRS) from the Autism Brain Imaging Data Exchange repository. Dynamic Independent Component Analysis was performed in both datasets using the CONN toolbox. An additional sliding-window analysis was performed in the replication study to explore different connectivity states (from highly negatively to highly positively correlated). Dynamic FC was reduced in ASC compared to TD adults in both the exploratory and replication datasets and was associated with increased SRS scores (especially in ASC). Regression analyses revealed that decreased SRS autistic expression was predicted by engagement of highly negatively correlated states, while engagement of highly positively correlated states predicted increased expression. These findings provided consistent evidence that the difficulties observed in ASC are associated with altered patterns of dFC between brain regions subserving attention reorienting and ToM processes and may serve as a biomarker of autistic trait expression.
Autism research : official journal of the International Society for Autism Research, 2024 · doi:10.1002/aur.3117