The experimental determination of unique green in the spectrum

The notion is gaining currency that observers who are distributed normally with respect to commonly measured indices of color vision, may be bimodally distributed with respect to the spectral locus of unique green. Experimental conditions which can produce such deviations from a normal distribution are explored, and it is concluded that the “bimodality” results reported in the literature may reflect differential chromatic adaptation effects. Experimental conditions which guarantee a neutral state of adaptation yield spectral unique green loci that show no evidence of bimodality.     

Multi-digit number processing beyond the two-digit number range: a combination of sequential and parallel processes

Investigations of multi-digit number processing typically focus on two-digit numbers. Here, we aim to investigate the generality of results from two-digit numbers for four- and six-digit numbers. Previous studies on two-digit numbers mostly suggested a parallel processing of tens and units. In contrast, the few studies examining the processing of larger numbers suggest sequential processing of the individual constituting digits. In this study, we combined the methodological approaches of studies implying either parallel or sequential processing. Participants completed a number magnitude comparison task on two-, four-, and six-digit numbers including unit-decade compatible and incompatible differing digit pairs (e.g., 32_47, 3<4 and 2<7 vs. 37_52, 3<5 but 7>2, respectively) at all possible digit positions. Response latencies and fixation behavior indicated that sequential and parallel decomposition is not exclusive in multi-digit number processing. Instead, our results clearly suggested that sequential and parallel processing strategies seem to be combined when processing multi-digit numbers beyond the two-digit number range. To account for the results, we propose a chunking hypothesis claiming that multi-digit numbers are separated into chunks of shorter digit strings. While the different chunks are processed sequentially digits within these chunks are processed in parallel.     

Parental grief of a perinatal loss: A comparison of individual and relationship variables

Abstract

This study focuses on the comparison of individual variables of bereavement, depression, and stress with variables associated with the couple relationship, including cohesion, adaptability, communication, satisfaction, and partner support. In total, 24 couples completed self-report instruments within 2 weeks after a miscarriage. Mothers had significantly stronger grief reactions than fathers. Fathers and mothers perceived their relationships similarly as highly functional. Except for mothers' depression and their satisfaction with the couple relationship, the correlations between individual and relationship variables were rather weak. Implications of the results for family professionals are discussed.     

Emotion regulation difficulties in trauma survivors: the role of trauma type and PTSD symptom severity

Two different hypotheses regarding the relationship between emotion regulation and PTSD are described in the literature. First, it has been suggested that emotion regulation difficulties are part of the complex sequelae of early-onset chronic interpersonal trauma and less common following late-onset or single-event traumas. Second, PTSD in general has been suggested to be related to emotion regulation difficulties. Bringing these two lines of research together, the current study aimed to investigate the role of trauma type and PTSD symptom severity on emotion regulation difficulties in a large sample of trauma survivors (N=616). In line with the hypotheses, PTSD symptom severity was significantly associated with all variables assessing emotion regulation difficulties. In addition, survivors of early-onset chronic interpersonal trauma showed higher scores on these measures than survivors of single-event and/or late-onset traumas. However, when controlling for PTSD symptom severity, the group differences only remained significant for 2 out of 9 variables. The most robust findings were found for the variable "lack of clarity of emotions." Implications for future research, theoretical models of trauma-related disorders, and their treatment will be discussed.     

The development of hazard perception: Dissociation of visual orientation and hazard processing

Eye movements are a key behavior for visual information processing in traffic situations and for vehicle control. Previous research showed that effective ways of eye guidance are related to better hazard perception skills. Furthermore, hazard perception is reported to be faster for experienced drivers as compared to novice drivers. However, little is known whether this difference can be attributed to the development of visual orientation, or hazard processing. In the present study, we compared eye movements of 20 inexperienced and 20 experienced drivers in a hazard perception task. We separately measured (a) the interval between the onset of a static hazard scene and the first fixation on a potential hazard, and (b) the interval between the first fixation on a potential hazard and the final response. While overall RT was faster for experienced compared to inexperienced drivers, the scanning patterns revealed that this difference was due to faster processing after the initial fixation on the hazard, whereas scene scanning times until the initial fixation on the hazard did not differ between groups.     

Ego involvement moderates the assimilation effect of affective expectations

Based on the affective expectations model and research on mental effort mobilization, two experiments manipulated affective expectations (no expectations versus positive expectations) and ego involvement (low versus high) and assessed participants’ affective reactions to hedonically neutral stimuli. In Experiment 1, evaluations were more positive when participants had positive expectations about neutral photos—but only when ego involvement was low. High ego involvement neutralized this affective expectation assimilation effect. Experiment 2 replicated these findings for experienced mood after reading a hedonically neutral short essay. Furthermore, high ego involvement led to longer response latencies in the affect ratings in Study 1. The findings support the idea that high ego involvement resulted in relatively high mental effort that was necessary to detect discrepancies between affective expectations and stimuli’s real affective potential and therefore moderated the assimilation effect to affective expectations.