Estimating discrimination performance in two-alternative forced choice tasks: Routines for MATLAB and R

Ulrich and Vorberg (Attention, Perception, & Psychophysics 71: 1219–1227, 2009) introduced a novel approach for estimating discrimination performance in two-alternative forced choice (2AFC) tasks. This approach avoids pitfalls that are inherent when the order of the standard and the comparison is neglected in estimating the difference limen (DL), as in traditional approaches. The present article provides MATLAB and R routines that implement this novel procedure for estimating DLs. These routines also allow to account for processing failures such as lapses or finger errors and can be applied to experimental designs in which the standard and comparison differ only along the task-relevant dimension, as well as to designs in which the stimuli differ in more than one dimension. In addition, Monte Carlo simulations were conducted to check the quality of our routines.     

Trial-by-trial updating of an internal reference in discrimination tasks: Evidence from effects of stimulus order and trial sequence

In psychophysics, participants are often asked to discriminate between a constant standard and a variable comparison. Previous studies have shown that discrimination performance is better when the comparison follows, rather than precedes, the standard. Prominent difference models of psychophysics and decision making cannot easily explain this order effect. However, a simple extension of this model class involving dynamical updating of an internal reference accounts for this order effect. In addition, this Internal Reference Model (IRM) predicts sequential response effects. We examined the predictions of IRM in two duration discrimination experiments. The obtained results are in agreement with the predictions of IRM, suggesting that participants update their internal reference on every trial. Additional simulations show that IRM also accounts for the negative sequential effects observed in single-stimulus paradigms.     

Psychisches Risiko „Großstadtleben“

The material determining factors of mental stress and diseases are comparatively rarely reflected on and analysed in depth in psychotherapy research and by psychotherapists. This article should be seen as a plea to look at these factors in more detail. When this involves the question of the influence of risk factors of city lifestyle conditions on the mental health of its inhabitants, the urban environment“city” is the melting pot for a multitude of individual factors and factor constellations the influence of which must be theoretically conceptualized and empirically collated.     

Task relevance modulates processing of distracting emotional stimuli

Relatively little is known about the integration of people's fear-related dispositions and their expectations about stressful events. This research used information integration theory to examine how participants’ anxiety sensitivity and event expectancy are integrated to determine their social anxiety. Three studies were conducted—two with university students and one with anxiety clinic patients—in which participants were presented with multiple scenarios of a socially embarrassing event, each representing a different degree of event probability, from which subjective expectancies were derived. Independent variables included anxiety sensitivity (low, moderate, high) and event expectancy (low, medium, high, no probability information). Participants were asked to indicate their anxiety (dependent measure) in each expectancy condition in this 3 × 4 mixed, quasi-experimental design. The results of all three studies strongly suggest that anxiety sensitivity and event expectancy are integrated additively to produce social anxiety. Additional results and their implications for the treatment of anxiety-related disorders are also discussed.     

Interpersonal psychotherapy for eating disorders with co-morbid depression: A pilot study

Objective: Patients with eating disorders (ED) often suffer from co-morbid depression, which may complicate the ED treatment. Previous studies have found that ED interventions seem to have limited capacity to reduce depressive symptoms. Several studies of interpersonal psychotherapy (IPT), have found that when patients have been treated for depression, co-morbid symptoms have diminished. As depression and EDs are commonly co-occurring conditions, this pilot study aimed to examine the effect of an IPT treatment for these conditions, with the focus on the depressive symptoms.

Method: In this multi-centre study, 16 patients with EDs and co-occurring major depression received 16 weeks of depression-focused IPT.

Results: Significant improvements with substantial effect sizes were found for both depression (d = 1.48) and ED (d = .93). Symptom reduction in the two syndromes were strongly correlated (r = .625, p = .004). Patients with a restrictive ED did not improve on either depression or ED symptoms.

Conclusion: These findings point to the usefulness of IPT for concurrent depression and ED with a bingeing/purging symptomatology. Working with negative affect and problem-solving related to current interpersonal problems may alleviate general psychological distress among these patients.     

Exploring the validity of scores from the Rosenberg Self-Esteem Scale (RSES) in Burundi: A multi-strategy approach

The present study aimed to validate the Rosenberg Self-Esteem Scale (RSES) in Burundi, through a multi-strategy approach used in cross-cultural studies. Respondents were 906 health workers (men = 56%; caregivers 60%). They responded to a bilingual version of RSES. We utilised Confirmatory Factorial Analysis (CFA) with structural equation modelling and a back translation test to explore the structure of the RSES and the reliability of scores from the scale. Data from an independent sample were analysed for the reliability of scores assessment. CFA results suggested that the global RSES factor was likely contaminated by a method-effect; mainly associated with negatively worded items. Internal consistencies and a back-translation test demonstrated that the negatively worded items were unsuitable in this context. The independent sample study confirmed poor reliability and internal consistency of scores for both alternative language versions of the RSES. Our data suggested that an overall cultural effect, rather than a merely specific language effect, may undermine the cross-cultural transportability of the Western scale.     

Suspicious Minds at Risk? The Role of Meaning in Processing War and Peacekeeping Experiences

The purpose of this study was to examine meaning as a mediator between perceived threat and posttraumatic stress responses among a sample of 1,561 veterans who participated in war or peacekeeping operations. Data were collected by questionnaire. Path analysis was performed to assess the expected relationships between the observed variables. Meaning in terms of distrust and personal benefits partially mediated the relation between perceived threat and posttraumatic stress responses. Distrustful beliefs about others and the world were strongly associated with perceived threat, as well as intrusive and avoidant thoughts. Creating meaning in terms of a positive worldview appears to be an important mission after military deployment.     

Fusion prevents the redundant signals effect: evidence from stereoscopically presented stimuli

In a simple reaction time (RT) experiment, visual stimuli were stereoscopically presented either to one eye (single stimulation) or to both eyes (redundant stimulation), with brightness matched for single and redundant stimulations. Redundant stimulation resulted in two separate percepts when noncorresponding retinal areas were stimulated, whereas it resulted in a single fused percept when corresponding areas were stimulated. With stimulation of noncorresponding areas, mean RT was shorter to redundant than to single stimulation, replicating the redundant signals effect (RSE) commonly found with visual stimuli. With stimulation of corresponding areas, however, no RSE was observed. This suggests that the RSE is driven by the number of percepts rather than by the number of stimulated receptors or sensory organs. These results are consistent with previous findings in the auditory modality and have implications for models of the RSE.     

A randomized controlled trial of mother–infant psychoanalytic treatment: II. Predictive and moderating influences of qualitative patient factors

A randomized control trial was performed on 75 dyads in Stockholm, Sweden, with infants under 1½ years. It recruited mothers who worried about the babies, themselves as mothers, and/or the mother–baby relationship. Two groups of mother–infant dyads were compared. One received only Child Health Centre care (the “CHCC” group) while the other received mother–infant psychoanalytic treatment plus CHCC (the “MIP” group). Significant treatment effects were found on mother‐reported depression, interviewer‐rated dyadic relationship qualities and externally rated maternal sensitivity, and near‐significant effects on mother‐reported stress, all in favor of MIP. The objective of this study is to investigate the predictive and moderating influences on outcomes by qualitatively assessed maternal and infant characteristics. The qualitative factors covered maternal suitability for psychoanalysis, and “ideal types” of mother and child, respectively. Outcome measures from two interviews with a 6‐month interval were depression (Edinburgh Postnatal Depression Scale (J. Cox, J. Holden, & R. Sagovsky, 1987 ), stress (Swedish Parental Stress Questionnaire (M. Östberg, B. Hagekull, & S. Wettergren, 1997 ), distress (Swedish Symptom Checklist‐90 (SCL‐90; L.R. Derogatis, 1994 ; M. Fridell, Z. Cesarec, M. Johansson, & S. Malling Thorsen, 2002 ) and infant social and emotional functioning (Ages and Stages Questionnaire: Social–Emotional (J. Squires, D. Bricker, K. Heo, & E. Twombly, 2002 ), relationship qualities (Parent–Infant Global Assessment Scale (PIR‐GAS; ZERO TO THREE, 2005), and videotaped interactions (Emotional Availability Scales, Z. Biringen, J.L. Robinson, & R.N. Emde, 1998 ). Suitability for psychoanalysis predicted outcome only on the PIR‐GAS. Two overarching maternal ideal types were created, reflecting their attitude to the psychoanalytic process: “Participators” and “Abandoned.” The Participators benefited more from MIP than they did from CHCC on maternal interactive sensitivity. A contrasting, but nonsignificant, pattern was found among the Abandoned mothers. Two ideal types of babies emerged: those “Affected” and “Unaffected” by the disturbance, respectively. Among Affected babies, dyadic relationships and sensitivity among their mothers improved significantly more from MIP than they did from CHCC. The superior effects of MIP applied especially to Participator mothers and Affected infants. For Abandoned mothers and Unaffected infants, CHCC seemed to be of equal value.     

Is color an integral part of a rich mental simulation?

Research suggests that language comprehenders simulate visual features such as shape during language comprehension. In sentence-picture verification tasks, whenever pictures match the shape or orientation implied by the previous sentence, responses are faster than when the pictures mismatch implied visual aspects. However, mixed results have been demonstrated when the sentence-picture paradigm was applied to color (Connell, Cognition, 102(3), 476–485, 2007; Zwaan & Pecher, PLOS ONE, 7(12), e51382, 2012). One of the aims of the current investigation was to resolve this issue. This was accomplished by conceptually replicating the original study on color, using the same paradigm but a different stimulus set. The second goal of this study was to assess how much perceptual information is included in a mental simulation. We examined this by reducing color saturation, a manipulation that does not sacrifice object identifiability. If reduction of one aspect of color does not alter the match effect, it would suggest that not all perceptual information is relevant for a mental simulation. Our results did not support this: We found a match advantage when objects were shown at normal levels of saturation, but this match advantage disappeared when saturation was reduced, yet still aided in object recognition compared to when color was entirely removed. Taken together, these results clearly show a strong match effect for color, and the perceptual richness of mental simulations during language comprehension.