Biology:Task-positive network
The task-positive network is a network of areas in the human brain that typically responds with activation increases to attention-demanding tasks in functional imaging studies.[1] The task-positive network encompasses regions of the dorsal attention system, but in addition includes dorsolateral and ventrolateral prefrontal regions, the insular cortex, and the supplementary motor area.[1] Recent work indicates that the cerebellum may participate in this network as well.[2][3] Notably, the nodes of this network are also correlated during rest (i.e., in the absence of any task).[1] The task-positive network is anti-correlated with the default mode network.[1][4] Competing activation between the task-positive network and the default mode network at the time of memory encoding has been shown to result in poor long-term memory consolidation.[5] During rest the task-positive network has been claimed to subserve intermittent "external awareness", defined as the conscious perception through different sensory modalities of one's surrounding environment[further explanation needed].[6]
Function
During performance of attention-demanding tasks, prefrontal and parietal structures that comprise the task-positive network are characterized by increases in activation; in contrast, default mode network structures, including posterior cingulate[further explanation needed] and medial prefrontal cortices, are characterized by decreased activity. During wakeful rest, the opposite pattern emerges, with the default mode network becoming more active and the task-positive network less active.[7]
References
- ↑ 1.0 1.1 1.2 1.3 Fox, M. D.; Snyder, A. Z.; Vincent, J. L.; Corbetta, M.; Van Essen, D. C.; Raichle, M. E. (2005). "From The Cover: The human brain is intrinsically organized into dynamic, anticorrelated functional networks". Proceedings of the National Academy of Sciences 102 (27): 9673–9678. doi:10.1073/pnas.0504136102. ISSN 0027-8424. PMID 15976020.
- ↑ Somers, David C.; Halko, Mark A.; Levin, Emily J.; Osher, David E.; Tobyne, Sean M.; Brissenden, James A. (2018-11-05). "Topographic Cortico-cerebellar Networks Revealed by Visual Attention and Working Memory" (in English). Current Biology 28 (21): 3364–3372.e5. doi:10.1016/j.cub.2018.08.059. ISSN 0960-9822. PMID 30344119.
- ↑ Somers, David C.; Halko, Mark A.; Osher, David E.; Levin, Emily J.; Brissenden, James A. (2016-06-01). "Functional Evidence for a Cerebellar Node of the Dorsal Attention Network" (in en). Journal of Neuroscience 36 (22): 6083–6096. doi:10.1523/JNEUROSCI.0344-16.2016. ISSN 0270-6474. PMID 27251628.
- ↑ Fransson, P. (2005). "Spontaneous low-frequency BOLD signal fluctuations: an fMRI investigation of the resting-state default mode of brain function hypothesis.". Human Brain Mapping 26 (1): 15–29. doi:10.1002/hbm.20113. PMID 15852468.
- ↑ Lefebvre, Etienne; D’Angiulli, Amedeo (2019). "Imagery-Mediated Verbal Learning Depends on Vividness–Familiarity Interactions: The Possible Role of Dualistic Resting State Network Activity Interference". Brain Sciences 9 (6): 143. doi:10.3390/brainsci9060143. ISSN 2076-3425. PMID 31216699.
- ↑ Vanhaudenhuyse, Audrey; Demertzi, Athena; Schabus, Manuel; Noirhomme, Quentin; Bredart, Serge; Boly, Melanie; Phillips, Christophe; Soddu, Andrea et al. (1 March 2011). "Two Distinct Neuronal Networks Mediate the Awareness of Environment and of Self". Journal of Cognitive Neuroscience 23 (3): 570–578. doi:10.1162/jocn.2010.21488. PMID 20515407.
- ↑ Hamilton, J.Paul (2011). "Default-Mode and Task-Positive Network Activity in Major Depressive Disorder: Implications for Adaptive and Maladaptive Rumination". Biological Psychiatry 70 (4): 327–333. doi:10.1016/j.biopsych.2011.02.003. PMID 21459364. PMC 3144981. http://www.stanford.edu/group/mood/cgi-bin/wordpress/wp-content/uploads/2012/02/Hamilton_Furman_Chang_TPN_DMN_BP_2011.pdf. Retrieved 6 June 2014.
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