Greetings Earthlings! 🙂
The world of research is fast paced- every day new studies are published telling us new and exciting things about the human body. As the scientific community has yet to pinpoint the exact underlying mechanisms involved in autism, the wheel of research is constantly churning out new evidence to provide us with a better picture of the autistic brain.
Since my previous post about the neuroscience of autism, there have been several new and exciting insights into the physiology of the autistic brain, so I’ve decided to give you a brief summary of the research! 🙂
Folding in the Brain
In recent weeks a study has emerged that suggest that symptoms of autism may be attributed to excessive folding in the brain.
No- I’m not talking origami, but the formulation of the squiggly ridges or ‘folds’ that make up the brain (by a process known as gyrification) as you can see in the gif below:
Brain tissue folds to allow for a greater surface area for cognitive functioning within the cramped confines of the skull- like a bar of chocolate melts quicker when you break the pieces up, so too does the folded brain work more efficiently than if the surface were smooth.
Recent research shows that autists brains may not fold in the same way as their neurotypical peers. Some regions of the brain, such as those associated with facial recognition are smoother in autists, whereas other areas such as the temporal (sensory processing) and frontal lobes (memory and attention) show signs of exaggerated folding. Excessive folding in these areas could explain sensory sensitivities in autists, in addition to variations in memory and attention deficits. On the other hand, decreased folding in the occipital lobe may explain why autists struggle with facial reading and processing 🙂
In addition to folding, recent research has focused on the cerebellum (meaning little brain in Latin) which contains roughly 80% of the neurons of the brain whilst only taking up 10% of it’s total volume! Thought to be associated with implicit learning (learning without awareness like learning to ride a bike or to swim), sensory function and cognitive function, 3D analysis of MRI data suggests that the shape and structure of the cerebellum may be different in autism. It appears that in some autists the cerebellum is flatter on the right side (the flatter the tissue, the lower the efficiency of the brain), but in autists with higher functioning social skills the structure is closer to that of a neurotypical individual- which may explain some of the communication difficulties associated with autism as the right side of the cerebellum is associated with language processing.
Abnormal Brain Connections
MRI scans of preschoolers with autism have provided more evidence that the autistic brain is abnormally connected. In this study it appears that a number of brain networks connecting different areas of the brain show significant differences from neurotypicals. A number of components of the basal ganglia network in particular were altered in autism (which plays an important role in behaviour). Differences were also found in the para-limbic network which is also involved in behaviour in addition to emotional processing, motivation and self-control.
This may indicate the use of MRI scans to obtain faster autism diagnoses in the future, but it’s still very much early days 🙂
There we have it now dear Earthlings, hope you hadn’t missed me too much while I was away.
Enjoy the weekend everyone! 🙂