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Full-Text Articles in Social and Behavioral Sciences
Confirmation Of Correlation Between Brain Nerve Conduction Velocity And Intelligence Level In Normal Adults, T. Reed, Philip Vernon, Andrew Johnson
Confirmation Of Correlation Between Brain Nerve Conduction Velocity And Intelligence Level In Normal Adults, T. Reed, Philip Vernon, Andrew Johnson
Andrew M. Johnson
In 1992, Reed and Jensen [Intelligence 16 (1992) 259–272] reported a positive correlation (.26; p=.002; .37 after correcting for restricted intelligence range) between a brain nerve conduction velocity (NCV) and intelligence level in 147 normal male students. In the first follow-up of their study, we report on a study using similar NCV methodologies, but testing both male and female students and using more extensive measures of cognitive abilities. One-hundred eighty-six males and 201 females, aged 18–25 years, were tested in three different NCV conditions and with nine cognitive tests, including Raven Progressive Matrices as used by Reed and Jensen. None …
A Behavior Genetic Investigation Of The Relationship Between Leadership And Personality, Andrew Johnson, Philip Vernon, Julie Harris, Kerry Jang
A Behavior Genetic Investigation Of The Relationship Between Leadership And Personality, Andrew Johnson, Philip Vernon, Julie Harris, Kerry Jang
Andrew M. Johnson
Phenotypic research on leadership style has long considered the importance of individual differences in personality when identifying the behaviors associated with good leaders. Although leadership and many personality traits have been separately shown to be heritable, these constructs have not been examined with genetically informative data to identify common sources of heritability in the two domains. A logical extension to current research, therefore, is to examine the extent to which factors of personality are predictive of leadership dimensions and the extent to which unique genetic contributions to the relationship between personality and leadership style may be identified. Adult twin pairs …
The Genetic Basis Of Substance Abuse: Mediating Effects Of Sensation Seeking, Andrew Johnson, Philip Vernon
The Genetic Basis Of Substance Abuse: Mediating Effects Of Sensation Seeking, Andrew Johnson, Philip Vernon
Andrew M. Johnson
Most modern theories of personality are structured hierarchically, with broad higher-order dimensions predicting narrower trait-level variables. This approach is necessarily reductionist, proposing to summarize the majority of trait-specific variability with a smaller number of larger dimensions. Not surprisingly, therefore, significant research has been directed to determining what might be considered to be the most basic dimensions of personality—both with regards to the identification of how many factors are needed to describe personality, and what these factors might be called (Costa & McCrae 1992a; [29] and [30]; Tupes & Christal 1992; Zuckerman 1992; [121] and [122]. While these omnibus factors of …
Sex Difference In Brain Nerve Conduction Velocity In Normal Humans, T. Reed, Philip Vernon, Andrew Johnson
Sex Difference In Brain Nerve Conduction Velocity In Normal Humans, T. Reed, Philip Vernon, Andrew Johnson
Andrew M. Johnson
Nerve conduction velocity (NCV), the speed at which impulses travel along nerves, has been extensively determined in human peripheral nerves because of its clinical utility. In contrast, almost no studies have been made of human brain NCV. We determined brain NCVs in the visual nerve pathway for 185 male and 200 female university students ages 18-25 years. In each of three independent test conditions, we found that the mean NCV of male students is about 4% faster than in females (P < or = 0.0001 for each condition). These male students also have a shorter reaction time in each of seven …