Differential neural activation for camouflage detection task in Field-independent and Field-Dependent individuals: Evidence from fMRI

Journal of biosciences

Subash Khushu¹  Janani Rajagopalan²  Manas K Mandal1²  Pawan Kumar¹  Shilpi Modi¹ 

[1] NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Lucknow Road, Timarpur, Delhi, India$$;Defence Institute of Psychological Research (DIPR), Lucknow Road, Timarpur, Delhi, India$$

关键词: Camouflage;    Field-Dependece;    Field-Independence;    MRI;    visual perception;    visual search;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

It is not clearly known as to why some people identify camouflaged objects with ease compared with others. The literature suggests that Field-Independent individuals detect camouflaged object better than their Field-Dependent counterparts, without having evidence at the neural activation level. A paradigm was designed to obtain neural correlates of camouflage detection, with real-life photographs, using functional magnetic resonance imaging. Twenty-three healthy human subjects were stratified as Field-Independent (Fl) and Field-Dependent (FD), with Witkins Embedded Figure Test. FIs performed better than FDs (marginal significance; 𝑝=0.054) during camouflage detection task. fMRI revealed differential activation pattern between Fl and FD subjects for this task. One sample T-test showed greater activation in terms of cluster size in FDs, whereas FIs showed additional areas for the same task. On direct comparison of the two groups, Fl subjects showed additional activation in parts of primary visual cortex, thalamus, cerebellum, inferior and middle frontal gyrus. Conversely, FDs showed greater activation in inferior frontal gyms, precentral gyms, putamen, caudate nucleus and superior parietal lobule as compared to FIs. The results give preliminary evidence to the differential neural activation underlying the variances in cognitive styles of the two groups.

【 授权许可】

Unknown