Physiological patterns accompanying complex problem solving during warning and nonwarning conditions.

Physiological responses of 48 subjects were studied during both a warning and a nonwarning condition and during anagram problem solving. The warning condition was associated with heart rate deceleration and increased occurrence of galvanic skin responses (GSR), of skin conductance, and of tonic galvanic skin potentials (GSP). The warning condition also resulted in significantly faster solution rates. Problem solving was associated with increases in heart rate, occurrence of GSR, and skin conductance. The occurrence of phasic GSP habituated, but the occurrence of tonic GSP maintained a significant response frequency. Large increases in tonic GSP, with minimal phasic increases during problem solving, reflected the bidimensionality of electrodermal activity as a function of the task. These findings were interpreted to support Lacey's hypothesis of response fractionation and suggest the utility of physiological measures in the study of putative attentional functioning.     

Determination of CIE chromaticity coordinates of colored lights produced by a projection color mixer

A procedure for measuring the CIE chromaticity coordinates which avoids some of the problems encountered with the method reported by Murch (1972) is described.     

Note on Carroll's analytic simple structure

A method for computing the transformation matrix for Carroll's analytic simple structure (1) is presented. The procedure involves successively finding the smallest latent root and associated vector of symmetric matrices.     

Qualitative Assessment of Vaccination Hesitancy Among Members of the Apostolic Church of Zimbabwe: A Case Study

Vaccine hesitancy or lack of confidence in vaccines is considered a threat to the success of vaccination programs. The rise and spread of measles outbreaks in southern Africa in 2009–2010 were linked to objections among Apostolic Church members, estimated at about 3.5 million in Zimbabwe as of 2014. To inform planning of interventions for a measles–rubella vaccination campaign, we conducted an assessment of the factors contributing to vaccine hesitancy using data from various stakeholders. Among nine districts in three regions of Zimbabwe, we collected data on religious attitudes toward, and perceptions of, vaccines through focus group discussions with health workers serving Apostolic communities and members of the National Expanded Programme on Immunization; semi-structured interviews with religious leaders; and open-ended questions in structured interviews with Apostolic parents/caregivers. Poor knowledge of vaccines, lack of understanding and appreciation of the effectiveness of vaccinations, religious teachings that emphasize prayers over the use of medicine, lack of privacy in a religiously controlled community, and low levels of education were found to be the main factors contributing to vaccine hesitancy among key community members and leaders. Accepting vaccination in public is a risk of sanctions. Poor knowledge of vaccines is a major factor of hesitancy which is reinforced by religious teachings on the power of prayers as alternatives. Because parents/caregivers perceive vaccines as dangerous for their children and believe they can cause death or disease, members of the Apostolic Church have more confidence in alternative methods such as use of holy water and prayers to treat diseases. Under these circumstances, it is important to debunk the myths about the power of holy water on the one hand and disseminate positive information of the efficacy of vaccines on the other hand in order to reduce hesitancy. Education about vaccines and vaccination in conjunction with government intervention, for example, through the use of social distancing policies can provide a framework for reducing hesitancy and increasing demand for vaccination.     

Intra-individual reaction time variability in schizophrenia, depression and borderline personality disorder

Intra-individual reaction time variability (IIV) in neuropsychological task performance reflects short term fluctuations in performance. Increased IIV has been reported in patients with schizophrenia and could be related to a deficient neural timing mechanism, but the role of IIV in adult patients with other psychiatric disorders has not been established. Therefore, we compared IIV measures obtained in a Go/Nogo task from patients with schizophrenia, major depression and borderline personality disorder. IIV was increased for patients with schizophrenia. When correcting for differences in mean reaction time, depressive and borderline patients also showed increased IIV. Importantly, all groups showed a strong association between IIV and accuracy of task performance. This suggests that increased IIV might be a sensitive marker for the efficiency of top-down attentional control in all diagnostic groups. Aside from these similarities, the complete results including measures of IIV, mean reaction time and accuracy show differential patterns for patients with schizophrenia compared to those with borderline personality disorder or depression. These results are discussed with respect to common versus disorder-specific neural mechanisms underlying increased IIV.     

The face of chauvinism: How prejudice expectations shape perceptions of facial affect

Are individuals who chronically expect to be treated prejudicially biased toward perceiving rejecting emotions in the faces of out-group others? In two studies, participants watched a series of computer-generated movies showing animated faces morphing from expressions of rejection (i.e., contempt and anger) to acceptance, and indicated when the initial expression of rejection changed. We also assessed stigma consciousness. Study 1 tested the connection between gender-based stigma consciousness and perceptions of contempt in male vs. female faces among female participants. Study 2 examined this connection for both men and women and for perceptions of contempt as well as anger. Results show that prejudice expectations lead individuals to interpret out-group faces as more rejecting than in-group faces, but only for female perceivers, and not for males. Further, our results suggest that prejudice expectations affect perceptions of contempt, but not anger. These results are discussed in relation to intergroup relations and emotion.     

Is the loss of diagnosticity of the eye region of the face a common aspect of acquired prosopagnosia?

A recent study published in this journal has shown an abnormal performance at discriminating differences with respect to the eyes of unfamiliar faces in two acquired prosopagnosic patients, but preserved processing of the mouth region. Here we extend these findings by showing a similar lack of sensitivity to the eyes in the very same face matching experiment for the prosopagnosic patient PS, who also showed normal performance for detecting differences in the mouth region. These results complement previously published evidence that the patient PS presents a lack of sensitivity to diagnostic information located on the eyes of familiar faces during individual face recognition tasks. More generally, they indicate that the impaired processing of the eyes of faces is a fundamental aspect of acquired prosopagnosia that can arise following damage to different brain localizations.