Spatial coding and central patterns: is there something special about the eyes?

In this study we investigated in a Simon-like task whether task-irrelevant spatial information, delivered by centrally presented patterns, interfered with response selection in the same way as laterally presented stimuli. Second, we asked whether such interference was equal for different kinds of stimuli. Participants were required to respond to the colour of two framed squares, two arrows, or two schematic eyes by pressing one of two lateralized response keys. The results consistently show that the Simon effect occurs independently of the nature of the stimulus, as classically reported for lateralized stimuli. Response times were influenced by the direction and frame-relative position of the stimuli, being faster for responses corresponding to the direction indicated by the stimuli than for noncorresponding responses regardless of stimulus types. Contrary to findings with lateralized nondirectional stimuli, such an effect increased with increasing RTs indicating that for centrally presented patterns the extraction of spatial information is time consuming.     

Response inhibition and adaptations to response conflict in 6- to 8-year-old children: Evidence from the Simon effect

Several studies have shown that the Simon effect, which is the advantage of spatial correspondence between stimulus and response locations when the stimulus location is task-irrelevant, decreases with increasing response times and is affected by preceding-trial correspondence. These modulations suggest the existence of control mechanisms that adapt our behavior to current goals by responding to the conflict experienced within a trial and by preventing the recurrence of a conflict in the subsequent trial. The aim of the present study was to assess whether these control mechanisms, which are well consolidated in adults and in children older than 8 years of age, are present in children between 6 and 8 years old. To this end, we tested 32 first-grade (6–7 years) and 34 second-grade (7–8 years) children on a Simon task in which correspondence sequence was manipulated on a trial-by-trial basis. The Simon effect was larger for first- than for second-graders and decreased with increasing response times only in second-graders. Crucially, for both groups, the effect was reduced when the preceding trial was noncorresponding, and the reductions were comparable for the two groups, indicating that trial-by-trial control mechanisms are already present in first-grade children and may be dissociated from within-trial control adjustments.     

An Evaluation of Occupational Behavior in Individuals with and without Attention Deficit/Hyperactivity Disorder

Attention deficit/hyperactivity disorder (ADHD) is now conceptualized as a life-course persistent disorder, including impairments in the occupational functional domains. Occupational impairment is one of the considerations in contemporary diagnostic criteria for ADHD. This study compares the workplace behavior of 26 young adults without ADHD to 24 young adults with ADHD in a simulated pizza restaurant and delivery setting on a job application completion task, in a job interview, and on job performance tasks. Results indicated that there were significant differences in masked ratings of job interview performance, favoring the performance of individuals without ADHD. No significant differences were obtained for job applications and job performance. Results suggest that job interviewing skills may be an important area to address for individuals with ADHD entering the workforce.     

The role of attention in the occurrence of the affordance effect

It has been demonstrated that visual objects activate responses spatially corresponding to the orientation (left or right) of their graspable parts. To investigate the role of attention orienting in the generation of this effect, which we will refer to as affordance effect, we ran three experiments in which the target stimulus could either correspond or not with a dynamic event capturing attention. Participants were required to press a left or right key according to the vertical orientation (upward or inverted) of objects presented with their handles oriented to the right or to the left. In Experiments 1 and 2, the objects were located above or below fixation, while in Experiment 3, to assess the contemporary presence of the affordance and Simon effects, the objects were located to the left or right of fixation. The results showed that while the affordance effect, when evident, was always relative to the target object, irrespective of its attentional capturing properties, the Simon effect occurred relative to the event capturing attention. These findings suggest that automatic and controlled processes of visual attention may play a differential role in the occurrence of the two effects.     

Ingroup ambivalence and experienced affect: the moderating role of social identification

No previous work in the field of group‐related attitudes and emotions has investigated the possible affective consequences of ingroup ambivalence—that is, the consequences of having attitudes towards an ingroup that are simultaneously both positive and negative. The current study was designed to explore this issue. Ambivalent attitudes have been argued to be more psychologically salient to the individual than univalent ones. A linear increase in participants' experienced affect was therefore predicted as a function of their ambivalence toward the ingroup. However, consistent with the predictions of social identity theory, previous findings have shown that higher ingroup identifiers are more likely to be involved with the ingroup than lower identifiers. Accordingly, we predicted and found effects of ingroup ambivalence on affect for high but not low ingroup identifiers. Combining the findings of two distinct literatures, the initial evidence provided by this study exploratively traces the sources of the affective processes that are set in motion by the evaluation of one's own group in an intergroup context. Copyright © 2003 John Wiley & Sons, Ltd.     

The effects of intergroup context of evaluation on ambivalence toward the ingroup and the outgroup

A study is reported which examines the relations between ambivalence toward the ingroup and the outgroup. The basic assumption was that ambivalent attitudes in intergroup contexts contribute to satisfying two competing motivations of group members, i.e. establishment of positive distinctiveness for the ingroup and conformity to the fairness norm. Participants were asked to evaluate the ingroup and one other group by using unipolar (positively and negatively valenced) affect‐ and cognition‐based items. We predicted an interaction effect of target group (ingroup versus outgroup) and attitude domain (affect‐based versus cognition‐based) on ambivalence. Additional hypotheses were formulated taking separately into account the positive and the negative unipolar items. We expected that on positively valenced items the ingroup would be favoured over the outgroup on both affect‐ and cognition‐based evaluations. Besides, we predicted that on negatively valenced items, the ingroup would be favoured over the outgroup on affect‐based evaluation but not on cognition‐based evaluation. Results indicated support for the predictions and shed light on the moderating role played by attitude domains on both ambivalence and ingroup favouritism. Copyright © 2002 John Wiley & Sons, Ltd.     

Co-occurrence of sequential and practice effects in the Simon task: Evidence for two independent mechanisms affecting response selection

The Simon effect refers to the observation that responses to a relevant stimulus dimension are faster and more accurate when the stimulus and response spatially correspond than when they do not, even though stimulus position is irrelevant. Recent findings have suggested that the Simon effect can be strongly modulated by prior practice with a spatially incompatible mapping and by correspondence sequence. Although practice is thought to influence conditional stimulus —response (S-R) processing, leaving response priming through the unconditional route unaffected, sequential effects are thought to represent trial-by-trial adaptations that selectively involve unconditional S —R processing. In the present study, we tested this assumption by assessing the effects of correspondence sequence both when the Simon task alone was performed and when it was preceded by a spatial compatibility task with either incompatible (Experiments 1-2) or compatible (Experiment 2) instructions. The observation that practice and correspondence sequence co-occur and exert additive effects strongly demonstrates that the two factors affect different processing routes.     

An electronic guidance system for multihandicapped blind persons: Evaluating its effectiveness and likableness

An electronic guidance system was used to help two multihandicapped blind persons move and carry out activities within a large setting. Both subjects had previously been exposed to a robot-assisted program. The electronic guidance system consisted of three parts: a control unit, infrared light sources, and a portable device. The portable device provided the subjects with direction feedbacks concerning the activity places. Data showed that both subjects learned to use the device and thus could profitably engage in mobility and activity. When allowed to choose between the new system and the robot, one subject preferred the robot, the other the new system. A group of parents, who were shown video-tapes of the two subjects while working with the new system and with the robot, preferred the new system. Efficacy, likableness and cost of this system and of the robot are discussed.     

Psychological resilience after disaster: New York City in the aftermath of the September 11th terrorist attack

Research on adult reactions to potentially traumatic events has focused almost exclusively on posttraumatic stress disorder (PTSD). Although there has been relatively little research on the absence of trauma symptoms, the available evidence suggests that resilience following such events may be more prevalent than previously believed. This study examined the prevalence of resilience, defined as having either no PTSD symptoms or one symptom, among a large (n= 2,752) probability sample of New York area residents during the 6 months following the September 11th terrorist attack. Although many respondents met criteria for PTSD, particularly when exposure was high, resilience was observed in 65.1% of the sample. Resilience was less prevalent among more highly exposed individuals, but the frequency of resilience never fell below one third even among the exposure groups with the most dramatic elevations in PTSD.