ELIZA

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318584 occurrences (No.68 in the rank) during 5 years in the PubMed. [no cache] 500 found

212) First, low-executive OAs showed greater success-related activity in the PFC, whereas low-memory OAs showed greater success-related activity in the MTLs.

--- ABSTRACT ---

PMID:24152545 DOI:10.1093/cercor/bht289

2015 Cerebral cortex (New York, N.Y. : 1991)

* Less wiring, more firing: low-performing older adults compensate for impaired white matter with greater neural activity.

- The reliable neuroimaging finding that older adults often show greater activity (over-recruitment) than younger adults is typically attributed to compensation. Yet, the neural mechanisms of over-recruitment in older adults (OAs) are largely unknown. Rodent electrophysiology studies have shown that as number of afferent fibers within a circuit decreases with age, the fibers that remain show higher synaptic field potentials (less wiring, more firing). Extrapolating to system-level measures in humans, we proposed and tested the hypothesis that greater activity in OAs compensates for impaired white-matter connectivity. Using a neuropsychological test battery, we measured individual differences in executive functions associated with the prefrontal cortex (PFC) and memory functions associated with the medial temporal lobes (MTLs). Using event-related functional magnetic resonance imaging, we compared activity for successful versus unsuccessful trials during a source memory task. Finally, we measured white-matter integrity using diffusion tensor imaging. The study yielded 3 main findings. First, low-executive OAs showed greater success-related activity in the PFC, whereas low-memory OAs showed greater success-related activity in the MTLs. Second, low-executive OAs displayed white-matter deficits in the PFC, whereas low-memory OAs displayed white-matter deficits in the MTLs. Finally, in both prefrontal and MTL regions, white-matter decline and success-related activations occurred in close proximity and were negatively correlated. This finding supports the less-wiring-more-firing hypothesis, which provides a testable account of compensatory over-recruitment in OAs.

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(1)21 and	(18)4 or	(35)2 Chilean	(52)2 energy
(2)19 laser	(19)4 socioeconomic	(36)2 HLB	(53)2 families
(3)11 doses	(20)3 Er:YAG	(37)2 OAs	(54)2 genetic
(4)11 levels	(21)3 O2	(38)2 acculturation	(55)2 group
(5)10 null	(22)3 PFR	(39)2 activities	(56)2 maternal
(6)10 cost	(23)3 PbB	(40)2 activity	(57)2 method
(7)10 lipoprotein	(24)3 STT	(41)2 after	(58)2 molecular
(8)8 back	(25)3 concentrations	(42)2 areas	(59)2 oral
(9)8 birth	(26)3 educational	(43)2 at	(60)2 pH
(10)8 dose	(27)3 features	(44)2 bioavailability	(61)2 peer
(11)7 in	(28)3 risk	(45)2 body	(62)2 population
(12)7 level	(29)3 serum	(46)2 cancer	(63)2 radiation
(13)6 birthweight	(30)3 shear	(47)2 children	(64)2 resilience
(14)5 but	(31)3 tumours	(48)2 coverage	(65)2 running
(15)4 as	(32)3 vagal	(49)2 degree	(66)2 sensitivity
(16)4 carbon	(33)3 water	(50)2 density	(67)2 settings
(17)4 income	(34)3 whole-body	(51)2 education	(68)2 temperature

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--- WordNet output for low --- =>安い, 低いところ, 卑劣に, 粗食で, 低い(もの), 弱い, 粗末な, 乏しい, 衿ぐりが深い, 建物の低い, 下劣な, 低級な Overview of noun low The noun low has 4 senses (no senses from tagged texts) 1. low, depression -- (an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow") 2. Low, David Low, Sir David Low, Sir David Alexander Cecil Low -- (British political cartoonist (born in New Zealand) who created the character Colonel Blimp (1891-1963)) 3. low -- (a low level or position or degree; "the stock market fell to a new low") 4. first gear, first, low gear, low -- (the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving) Overview of verb low The verb low has 1 sense (no senses from tagged texts) 1. moo, low -- (make a low noise, characteristic of bovines) Overview of adj low The adj low has 10 senses (first 6 from tagged texts) 1. (55) low -- (less than normal in degree or intensity or amount; "low prices"; "the reservoir is low") 2. (23) low -- (literal meanings; being at or having a relatively small elevation or upward extension; "low ceilings"; "low clouds"; "low hills"; "the sun is low"; "low furniture"; "a low bow") 3. (11) low, low-toned -- (very low in volume; "a low murmur"; "the low-toned murmur of the surf") 4. (6) low -- (unrefined in character; "low comedy") 5. (4) low, low-pitched -- (used of sounds and voices; low in pitch or frequency) 6. (3) abject, low, low-down, miserable, scummy, scurvy -- (of the most contemptible kind; "abject cowardice"; "a low stunt to pull"; "a low-down sneak"; "his miserable treatment of his family"; "You miserable skunk!"; "a scummy rabble"; "a scurvy trick") 7. humble, low, lowly, modest, small -- (low or inferior in station or quality; "a humble cottage"; "a lowly parish priest"; "a modest man of the people"; "small beginnings") 8. depleted, low -- (no longer sufficient; "supplies are low"; "our funds are depleted") 9. broken, crushed, humbled, humiliated, low -- (subdued or brought low in condition or status; "brought low"; "a broken man"; "his broken spirit") 10. gloomy, grim, blue, depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited -- (filled with melancholy and despondency ; "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted") Overview of adv low The adv low has 1 sense (first 1 from tagged texts) 1. (3) low -- (in a low position; near the ground; "the branches hung low") --- WordNet end ---