SIZE ISNT EVERYTHING - A STUDY OF BRAIN VOLUME, INTELLIGENCE AND AUDITORY-EVOKED POTENTIALS
SIZE ISNT EVERYTHING - A STUDY OF BRAIN VOLUME, INTELLIGENCE AND AUDITORY-EVOKED POTENTIALS
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DOI：
10.1016/0191-8869(94)90283-6
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发表时间：
1994-09-01
影响因子：
4.3
通讯作者：
BEST, JJK
中科院分区：
文献类型：
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作者：
EGAN, V;CHISWICK, A;BEST, JJK
尽管通过磁共振 (MR) 成像计算出的脑容量已被发现与智商相关。 MR 产生的脑容量与其他心理过程之间的关系尚未得到研究。使用 MR 扫描计算 50 名能力正常的成年人的脑容量，同时执行测量智商、记忆力和信息处理速度的任务，以及听觉诱发电位 (AEP) 任务。所有 MR 扫描均针对因线圈响应不均匀而产生的伪影进行了校正。在测量的三个 AEP 组成部分中，只有 P3 潜伏期和波幅与心理能力测量相关。在接受测试的 50 名成年人中，有 40 人拥有可用的 MR 记录。校正身高和体重后，总脑容量与全量表智商相关（r = 0.32，P < 0.025）；当这种相关性针对限制范围进行校正时，相关性增加到 0.66。尽管双变量相关性的脑容量与记忆或信息处理速度的个体测量之间没有系统的关联模式，但探索性多元回归调整后的 R2 表明，虽然信息处理速度与脑容量共享测试方差的 7%，但记忆力可能占 22%，而完整的测试组合可能占 32%。因此，我们的研究表明，智力背后的机制之间存在部分分离，因为大脑体积与心理能力和记忆力相关，但与信息处理速度无关。
Although brain volumes calculated from magnetic resonance (MR) imaging have been found to correlate with IQ. the relationship between MR-derived brain volume and other mental processes has not been examined. Fifty normal-ability adults had their brain volume calculated using MR scanning, along with tasks measuring IQ, memory, and information-processing speed, and an auditory evoked potential (AEP) task. All MR scans were corrected for artefacts arising from inhomogenous coil response. Of the three AEP components measured, only P3 latency and amplitude were associated with measures of mental ability. Out of the 50 adults tested, 40 had usable MR records. Corrected for height and weight, total brain volume was associated with Full-Scale IQ (r = 0.32, P < 0.025); when this correlation was corrected for restricted range, the correlation increased to 0.66. Although there was no systematic pattern of associations between brain volume and individual measures of memory or information-processing speed for the bivariate correlations, adjusted R2s from exploratory multiple regression suggested that while information-processing speed shared 7% of test variance with brain volume, memory might account for 22%, and the complete test battery might account for as much as 32%. Our study therefore suggests a partial dissociation between mechanisms underlying intelligence, in that brain volume is associated with mental ability and memory, but not especially with information-processing speed.