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299123 occurrences (No.77 in the rank) during 5 years in the PubMed. [no cache] 500 found

157) The study yielded 3 main findings.

--- 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.

--- ABSTRACT END ---

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(1)88 suggest	(15)10 revealed	(29)3 for	(43)2 during
(2)27 indicate	(16)9 may	(30)3 highlighted	(44)2 give
(3)24 of	(17)8 show	(31)3 imply	(45)2 hold
(4)23 null	(18)7 showed	(32)3 indicated	(46)2 implicate
(5)23 from	(19)7 underscore	(33)3 regarding	(47)2 into
(6)17 are	(20)6 to	(34)3 that	(48)2 is
(7)17 support	(21)5 suggested	(35)3 the	(49)2 lend
(8)14 provide	(22)4 also	(36)3 will	(50)2 or
(9)12 have	(23)4 included	(37)2 add	(51)2 point
(10)12 highlight	(24)4 on	(38)2 at	(52)2 provided
(11)12 in	(25)4 reveal	(39)2 by	(53)2 related
(12)12 were	(26)4 we	(40)2 call	(54)2 should
(13)11 and	(27)3 could	(41)2 confirm	(55)2 suggesting
(14)10 demonstrate	(28)3 demonstrated	(42)2 contribute	(56)2 suggestive

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--- WordNet output for findings --- =>研究(調査)結果 Overview of noun findings The noun findings has 1 sense (no senses from tagged texts) 1. findings -- (a collection of tools and other articles used by an artisan to make jewelry or clothing or shoes) Overview of noun finding The noun finding has 3 senses (first 3 from tagged texts) 1. (16) determination, finding -- (the act of determining the properties of something, usually by research or calculation; "the determination of molecular structures") 2. (3) finding -- (the decision of a court on issues of fact or law) 3. (1) finding -- (something that is found; "the findings in the gastrointestinal tract indicate that he died several hours after dinner"; "an area rich in archaeological findings") --- WordNet end ---