Precuneus and surface

Bruner et al 2015One year ago we showed that a main source of variation among adult human brains is due to the proportions of the precuneus. This seems to be a stand-alone feature, not integrated with other patent morphological changes of the brain form. The spatial pattern associated with the dilation/contraction of the precuneus is particularly similar to the parietal bulging characterizing the brain of our species in evolutionary terms. Now we have published a study of the anatomical factors associated with this shape change, namely an analysis of the whole precuneal volume (cortical surface and cortical thickness) in a sample of adult humans. The results suggest that the observed changes of precuneal shape and proportions are associated with actual changes in precuneal surface area. Therefore, it is a matter of absolute cortex volume, and not just of relative size. There are no differences in cortical thickness. The precuneal volume increases with positive allometry as brain size increases (that is, it increases more than the rest of the brain, as brains get bigger), but the individual differences – as well as the differences between hemispheres – are important. What is the cellular reason of such morphological variation? Number of neurons, connections, or other components?

Interestingly, such marked anatomical variation seems not influencing any standard psychometric variable. It can be hypothesized that traditional psychometric performances are not adequate to quantify the functions of the precuneus. This is likely most of all when taking into consideration its importance in the default mode network, which functions are not easy to capture with task-based metrics.

Advertisements

0 Responses to “Precuneus and surface”



  1. Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s




Enter your email address to follow this blog and receive notifications of new posts by email.

RSS Brain News

RSS Cognitive archaeology

  • DECODING MIMBRES PAINTING
    This extended abstract represents a summary introduction to a work in progress, which will culminate in a publication and exhibition at The Los Angeles County Museum of Art in 2018. It briefly outlines our discoveries and interpretations, which will be more fully presented, referenced and discussed in the forthcoming catalog. This presentation is available f […]

RSS The Skull Box

  • Brain Volume Database
    The Internet Brain Volume Database (IBVD) is an online collection of neuroimaging data funded as a part of the international initiative, the Human Brain Project. The IBVD provides access data for both individual and among-group comparisons that allow total volume comparisons with parallelization of the brain into hemispheres, specific lobes or grey matter vo […]

RSS Anthropology

RSS Human Evolution

  • An error has occurred; the feed is probably down. Try again later.

RSS Neurophilosophy

  • How to become a super memorizer – and what it does to your brain
    New research shows that we can train our brains to become memory champions To many of us, having to memorize a long list of items feels like a chore. But for others, it is more like a sport. Every year, hundreds of these ‘memory athletes’ compete with one another in the World Memory Championships, memorising hundreds of words, numbers, or other pieces of inf […]

Disclaimer

This blog publishes texts and comments of the author, which can not be referred to institutions or contexts outside of the blog itself. The published material may be partly derived or reported from the Web, and therefore evaluated in the public domain. If some content violates copyright or if it is considered inappropriate, please contact me, to promptly remove it. On the other hand, please cite this source whenever using images or texts from this website.

%d bloggers like this: