Cultural Neuroscience

Shihui Han and Georg Northoff have just published Culture-Sensitive Neural Substrates of Human Cognition: A Transcultural Neuroimaging Approach. This article will prove foundational for “cultural neuroscience,” a term Han & Northoff use near the end of the article. I highly recommend that everyone read the full version (pdf), but will outline and comment on it here.

In this Perspectives piece in Nature Neuroscience Reviews, Han and Northoff review the evidence on how culture influences neural mechanisms, highlight the need to integrate social neuroscience and cultural cognition research, argue for transcultural neuroimaging as an effective method for cultural neuroscience, and lay out implications for the future of this emerging field.

But if you don’t take my word for it, here’s their abstract:

Our brains and minds are shaped by our experiences, which mainly occur in the context of the culture in which we develop and live. Although psychologists have provided abundant evidence for diversity of human cognition and behaviour across cultures, the question of whether the neural correlates of human cognition are also culture-dependent is often not considered by neuroscientists. However, recent transcultural neuroimaging studies have demonstrated that one’s cultural background can influence the neural activity that underlies both high- and low-level cognitive functions. The findings provide a novel approach by which to distinguish culture-sensitive from culture-invariant neural mechanisms of human cognition.

Cultural Effects on Cognition

Han and Northoff systematically cover research on “cultural effects on cognition,” including perceptual processing, attentional modulation, language and music, and number representation and mental calculation. Their Figure 1, presented below, summarizes research on culture and attention, highlighting context-dependent differences in attention between Americans and East Asians.

Continue reading “Cultural Neuroscience”

New Four Stone Hearth

So the new Four Stone Hearth, the blog carnival of anthropology, is up at Almost Diamonds. Stephanie may not be an anthropologist, but she puts together a formidable list, including several Olympic-related posts, such as Rex’s (he’s still Alex to me) contribution at Savage Minds, Well I guess we should say something about the Olympics and a fascinating short post by Vaughn at Mind Hacks on cross-cultural studies of the immediate reaction to winning and losing among sighted and blind athletes. There’s a number of good archaeological posts (including Stone Pages pointing to a story about Australia’s less-than-enthusiastic attempts to preserve archaeological sites), a cluster on Neandertal research, and a fascinating piece on artificial language evolution in the laboratory from Anthropology.net (with actual people instead of computers doing the learning).

Lots of good stuff — so why are you still here and not reading it?!

Mental Health in the Aging

The average life expectancy is at its highest ever in history. Brain cells are built to live up to 127 years. However, they do not divide and replicate the same way other cells do, and so their vulnerability to attack by radiation and free radicals is more problematic. Cell loss in the normal ageing brain is patchy. There is a small stock of stem cells from which neuronal regeneration is possible, but scientists are still only just learning of their full functions now. It is believed that the brain shrinks with age. Amongst European populations it can shrink by as much as 15% between the ages of fifty and sixty-five.  Much of this reduction is due to brain cells shrinking as they lose water, while the spaces in the brain (called ventricles) and the folds of the cortex (called sulci) enlarge. Blood supply also diminishes slightly with age.

Of greatest importance are the connections between nerve cells. It is these connections that must constantly battle for survival. The gift of prolonged life is not without its anxieties. We worry about losing our memory and about the reduction in our cognitive performance. While there is an increase in the range and complexity of our language, this is accompanied by an increased frequency of mistakes, forgetting words or misnaming objects. We should remind ourselves that with age, there are greater powers of reflection and contemplation. The wonderful gift of experience is to be rejoiced. The aging brain has a greater capacity to deal with complex emotions and to complement decisions with a raft of knowledge. While the ageing brain is slower, it is this slowness in decision-making that allows time for better decisions to be made—this is called wisdom.

 

Links:

                               

Australian Centre for Posttraumatic Mental Health

Alzheimers Association Brain Health                                

American Society on Aging                                    

Alliance for Aging Research                                               

Cognitive and Emotional Health                             

Mental Health and Aging                                         

Aging and Mental Health                                         

Mental Health through the lifespan                         

Mental Health and Wellbeing                                              

Ageing and Mental Health                                       

Center for Mental Health and Aging                                   

Department of Aging and Mental Health