Neural signatures of number processing in human infants: evidence for two core systems underlying numerical cognition

Behavioral research suggests two cognitive systems are at the foundations of numerical thinking: one for representing 1-3 objects in parallel and one for representing and comparing large, approximate numerical magnitudes. We tested for dissociable neural signatures of these systems in preverbal infants, by recording event-related potentials (ERPs) as 6-7.5 month-old infants (n = 32) viewed dot arrays containing either small (1-3) or large (8-32) sets of objects in a number alternation paradigm. If small and large numbers are represented by the same neural system, then the brain response to the arrays should scale with ratio for both number ranges, a behavioral and brain signature of the approximate numerical magnitude system obtained in animals and in human adults. Contrary to this prediction, a mid-latency positivity (P500) over parietal scalp sites was modulated by the ratio between successive large, but not small, numbers. Conversely, an earlier peaking positivity (P400) over occipital-temporal sites was modulated by the absolute cardinal value of small, but not large, numbers. These results provide evidence for two early developing systems of non-verbal numerical cognition: one that responds to small quantities as individual objects and a second that responds to large quantities as approximate numerical values. These brain signatures are functionally similar to those observed in previous studies of non-symbolic number with adults, suggesting that this dissociation may persist over vast differences in experience and formal training in mathematics.     

Do the myths still exist? Revisiting people's negative beliefs about organ donation upon death

The prevalence of myths preventing people partial to donation in Australia from consenting is unknown. Respondents (N?=?468: 381 donors, 26 non-donors, 61 undecided) were surveyed about their (negative) donation beliefs. Approximately 30% of donors were neutral or supported negative beliefs about organ allocation, especially donation to undesirable organ recipients and a black market organ trade. Confusion about brain death, lack of family and religious support, and discomfort with donation were negative beliefs endorsed by some respondents irrespective of donor preference. Proportionally, donors had greater trust in hospitals/doctors than other groups. Some myths still exist but may vary with donation preference.     

The dark side of emotional intelligence: the role of gender and the Dark Triad in emotional manipulation at work

Objective : This study investigated people's willingness to emotionally manipulate others maliciously and disingenuously in the workplace. It also examined the role of gender, emotional intelligence, and the Dark Triad traits in this destructive behaviour. Method : A sample of employees (N = 765; 581 females, 184 males) from varying occupations completed measurements of emotional manipulation willingness in the workplace, emotional intelligence, and the Dark Triad. Results : T-tests revealed that females were significantly less likely than males to engage in both malicious and disingenuous emotional manipulation. In bivariate correlations, higher levels of emotional intelligence were associated with disingenuous emotional manipulation in females only. Emotional intelligence was also a significant contributor to disingenuous emotional manipulation in multiple regression analysis, indicating the existence of a “dark side to emotional intelligence” at work. In females, the magnitude of correlations (small to moderate) between the Dark Triad traits and both forms of emotional manipulation were similar. In males, both forms of emotional manipulation most strongly correlated with Machiavellianism, followed by narcissism, then psychopathy. Conclusion : This study is the first to demonstrate that good emotional intelligence skills can facilitate undesirable workplace behaviours. Emotional manipulation is elevated in males with a relentless drive to achieve goals, and in females with broader deceptive tendencies.