Prepulse inhibition of the startle eyeblink as an indicator of temporal summation

The inhibition of the human startle eyeblink response was assessed in three experiments in which the duration of the prepulse was manipulated. In all cases, inhibition of startle was more pronounced as prepulse duration increased from 6 to 50 msec. Inhibition of startle amplitude for single prepulses was not significantly different from that for paired prepulses (Experiment 1), but inhibition was more pronounced as prepulse intensity increased (Experiment 3). Varying the interval between prepulse offset and startle-stimulus onset had no significant effect on inhibition (Experiment 2). These data demonstrate the sensitivity of startle inhibition to prepulse duration, and suggest that this response system can be used to evaluate early temporal summation in the auditory system.     

Prepulse effects on magnitude estimation of startle-eliciting stimuli and startle responses

The present studies investigated the relationship between prepulse effects on the modification of the brainstem startle reflex and magnitude estimates of startle-eliciting stimuli. In Experiment 1, startle eyeblink responses were elicited in 24 students, half of whom were instructed to estimate the loudness of the startle stimulus (actual intensities of 80, 90, and 100 dB) and half of whom were instructed to estimate the magnitude of their eyeblink. When weak acoustic prepulses preceded the startle-eliciting stimulus, eyeblink amplitude was inhibited, and estimates of response magnitude decreased, but estimates of startle stimulus magnitude decreased only when 100-dB startle stimuli were presented. In Experiment 2, the same startle stimuli were preceded on some trials by a vibrotactile prepulse to the hand. In conditions in which startle amplitude was inhibited, startle stimulus magnitude estimates were not affected. This suggests that the effect of acoustic prepulses on 100-dB startle stimuli in Experiment 1 may have been due to loudness assimilation, an effect independent of the prepulse inhibition of startle responding.     

Facilitation and disruption of lateralized syllable processing by unattended stimuli in the opposite visual field

The influence of lateralized unattended stimuli on the processing of attended stimuli in the opposite visual field can shed light on the nature of information that is transferred between hemispheres. On a cued bilateral task, participants tried to identify a syllable in the attended visual field, which elicits a left hemisphere (LH) advantage and different processing strategies by the two hemispheres. The same or a different syllable or a neutral stimulus appeared in the unattended field. Transmission of unattended syllable codes between hemispheres is symmetric, as revealed by equal interference for the two visual fields. The LH is more accurate than the RH in encoding unattended syllables, as indicated by facilitation in the left but not right visual field and a greater frequency of identifiable intrusions into the left than right field. However, asymmetric encoding strategies are different for attended and unattended syllables.     

Personality and Serum Lipids: Does Lifestyle Account for Their Concurrent and Long‐term Relationships

This study evaluates concurrent and over time associations of personality with measures of three serum lipids associated coronary heart disease morbidity, namely, high‐density lipoprotein cholesterol (HDL‐C), low‐density lipoprotein cholesterol and triglyceride (TRI). Participants were individuals who underwent a health examination at two points of time, T1 (N = 3835) and T2 (N = 2283), about 2.5 years apart. Personality was assessed by the Five‐Factor Model. Health, socioeconomic status and healthy lifestyle behaviours (smoking intensity, physical activity and body weight) were controlled. Regression analyses indicate that the personality factors of neuroticism, extraversion and conscientiousness are each significantly associated with HDL‐C and TRI, both concurrently and over time. However, most of these associations decreased to marginal significance when adjusted for body weight or physical activity as possible mediators. Both concurrent and over time associations of the openness personality trait with HDL‐C and TRI were significant and persisted after adjustment for measures of a healthy lifestyle. This study emphasizes the importance of collecting measures of a healthy lifestyle to better understand how personality might influence serum lipids. Copyright © 2013 European Association of Personality Psychology     

Did Somebody See It? Applying the Verifiability Approach to Insurance Claim Interviews

We examined the application of the verifiability approach to insurance claim interviews. The verifiability approach states that truth tellers and liars differ from each other in terms of the number of details they give that can be verified. Eighty‐three true and false insurance claim statements, related to damage, theft, or loss, were coded in terms of ‘witnesses’ (was the incident witnessed by others) and ‘verifiability’ (the number of perceptual and contextual details provided that could be checked by the investigator). We found that the majority of liars, compared with half the truth tellers, described unwitnessed incidents. This difference between the groups allowed for the detection of liars only. Discrimination between liars and truth tellers based on the verifiability of details was not possible. The implications of these findings are discussed. Copyright © 2014 John Wiley & Sons, Ltd.     

Childhood Maltreatment and its Effect on Parenting among High-Risk Parents

Research evidence indicates that a childhood history of maltreatment affects parental behaviors in adulthood. The aim of the study was to investigate the predictors for parental behaviors among individuals who reported a history of maltreatment. The current study investigated whether attachment styles, emotional regulation and cognitive appraisals of parenting predicted parental behaviors (positive vs. negative). The study also investigated the differential effects of abuse experiences in childhood (physical, sexual, emotional, and neglect) on parental behaviors. The participants were 213 high-risk Jewish and Arab parents of children aged six and under. Participants completed five self-report questionnaires assessing parental behaviors, childhood experiences of abuse and neglect, attachment styles, emotional regulation, and cognitive appraisal of parenthood. The regression analyses revealed that personal attributes such as ethnicity, childhood experience of emotional abuse/neglect, emotional regulation, and appraisal of parenting, predict negative parental behavior. Anxious attachment and childhood emotional abuse and neglect moderated the impact of parenthood appraisal on parenting behaviors. Although physical and sexual abuse had the highest impact on insecure attachment, emotional abuse/neglect had higher predictive power for non-positive parenting. Clinical interventions for improving the capacity for emotional regulation and parent-child relational skills are suggested.