Upcoming Events

Neuroimaging Society in ALS meeting Dec 05, 2018 - Dec 06, 2018 — Chancellor's Building, Edinburgh, EH16 4SB
Edinburgh Imaging Alliance festive networking event Dec 11, 2018 06:00 PM - 09:00 PM — Room G07, Informatics Building, University of Edinburgh
European Molecular Imaging Meeting 2019 Mar 19, 2019 - Mar 22, 2019 — Scottish Event Campus, Glasgow
2nd International Conference on Medical Imaging with Deep Learning Jul 08, 2019 - Jul 10, 2019 — ICL South Kensington Campus, London
4th International Workshop on Image Processing Techniques and Applications Jul 22, 2019 - Jul 23, 2019 — Centre for Mathematical Imaging Techniques (CMIT), University of Liverpool, England

SINAPSE Image of the Month: Semantic Cognition Meta-Analysis Activation Likelihood Maps

February 2018 SINAPSE Image of the Month

Courtesy of Dr Paul Hoffman and Dr Alexa Morcom, this image shows activation likelihood maps generated by comparing contrasts of interest from young and older adults in a meta-analysis of 47 functional neuroimaging studies (PET and fMRI data). Contrasts of interest for this meta-analysis were computed from tasks that involved two experimental conditions in which one placed a greater demand on semantic cognition. Semantic cognition is the use of semantic knowledge, such as the meanings of words or sentences and knowledge relating to meaningful images. It is an important domain for research on neurocognitive ageing, as it has been thought to remain stable into older age unlike many other domains of cognition.

Functional neuroimaging studies of young adults have shown that semantic cognition is associated with activation of brain networks relatively lateralised to the left hemisphere, including inferior prefrontal, posterior temporal and inferior parietal cortex. This image shows direct comparisons of young and older adults, using an activation likelihood estimation (ALE) meta-analysis to investigate age-related differences in the neural basis of semantic cognition. Green regions are areas in which older adults were found to reliably exhibit more activation than young adults, and red regions are areas in which activation was reliably greater in young adults. Reduced activation in older adults was observed in a range of left-hemisphere regions linked with semantic processing, and also in left hippocampus and bilateral occipital cortex. In contrast, older adults showed increased activation in right frontal and parietal regions. This pattern of results indicates a shift from the neurally specialised left-lateralised semantic network in later life, with greater recruitment of domain-general neural resources.

 

The image is taken from a recent study published in Neuroscience & Biobehavioral Reviews:

Hoffman P & Morcom AM. Age-related changes in the neural networks supporting semantic cognition: A meta-analysis of 47 functional neuroimaging studies. Neuroscience & Biobehavioral Reviews 2018; 84:134-150.