Hemispheric visual atentional imbalance in patients with traumatic brain injury

We find a spatially asymmetric allocation of attention in patients with traumatic brain injury (TBI) despite the lack of obvious asymmetry in neurological indicators. Identification performance was measured for simple spatial patterns presented briefly to a locus 5 degrees into the left or right hemifield, after precuing attention to the same (ipsilateral) or opposite (cross-hemifield) side. Though the cue was non-predictive of target location overall, performance was significantly slower for cross than for ipsilateral trials in both patients and controls. We tested 21 TBI patients without overt focal brain damage and nine control subjects. Only patients demonstrated significantly worse performance for left side presentation in the ipsilateral condition. Furthermore, in the cross-hemifield condition, the left-right difference seen in TBI patients was significantly larger-reflecting a failure in producing a leftward attention shift. Again no significant difference was found in controls. These hemifield effects suggest an asymmetry in the ability of TBI patients in shifting attention to the left hemifield, whether from central fixation or from a cue in the contra-lateral hemifield. The results support basic hypotheses regarding visual attention: Attentional control may be asymmetric and attention may be a distributed, rather than localized cortical function.     

Implication des fonctions exécutives dans le décodage en lecture : étude comparative entre normolecteurs et faibles lecteurs de CE2

The implication of executive functions in reading was studied. Normo and poor third grade readers were compared in an illusory conjunction task using the selection of a letter features embedded in a grapheme or risen to the syllable boundary. Executive task of updating or shifting were then added to this task. According to decoding progress from graphemes to syllables we suppose that the cost of executive processing will be more important for poor readers. Results showed that addition of an executive control task to a selection task, led to an increase in response times for poor readers whatever the presentation (grapheme, syllable).     

Effects of normal aging on memory for multiple contextual features

Twenty-four younger (18-35 years) and 24 older adult participants (65 or older) were exposed to three experimental conditions involving the memorization words and their associated contextual features, with contextual feature complexity increasing from Conditions 1 to 3. In Condition 1, words presented varied only on one binary feature (color, size, or character), while in Conditions 2 and 3, words presented varied on two and three binary features, respectively. Each condition was carried out as follows: (1) learning of a word list; (2) encoding of words and their contextual features; (3) delay; and (4) memory for contextual features through a discrimination task. Results indicated that young adults discriminated more features than older adults on all conditions. In both age groups, contextual feature discrimination accuracy decreased as the number of features increased. Moreover, older adults demonstrated near floor performance when tested with two or more binary features. We conclude that increasing context complexity strains attentional resources.     

Attention to endpoints: a cross-linguistic constraint on spatial meaning

We investigate a possible universal constraint on spatial meaning. It has been proposed that people attend preferentially to the endpoints of spatial motion events, and that languages may therefore make finer semantic distinctions at event endpoints than at event beginnings. We test this proposal. In Experiment 1, we show that people discriminate the endpoints of spatial motion events more readily than they do event beginnings-suggesting a non-linguistic attentional bias toward endpoints. In Experiment 2, speakers of Arabic, Chinese, and English each described a set of spatial events displayed in video clips. Although the spatial systems of these languages differ, speakers of all three languages made finer semantic distinctions at event endpoints, compared to event beginnings. These findings are consistent with the proposal that event endpoints are privileged over event beginnings, in both language and perception.     

Mnemonic Context Effect in Two Cultures: Attention to Memory Representations?

In two experiments we demonstrate a substantial cross-cultural difference in a mnemonic context effect, whereby a magnitude estimate of a simple stimulus such as a line or circle is biased toward the center of the distribution of previously seen instances of the same class. In support of the hypothesis that Asians are more likely than Americans to disperse their attention to both the target stimulus and its mnemonic context, this effect was consistently larger for Japanese than for Americans. Moreover, the cultural difference was attenuated by an experimentally induced belief in class homogeneity that augmented the context effect itself in both cultures. More important, these belief effects happened in the absence of any objective change in stimulus distribution. Implications for sociocultural shaping of cognition are discussed.     

Two spatially separated attention systems in the visual field: evidence from inhibition of return

It has been demonstrated that the human visual field shows some functional inhomogeneities, in particular when the central and perifoveal regions are compared to the more peripheral regions. The present study examined this inhomogeneity by examining the effect of stimulus eccentricity on inhibition of return (IOR), a phenomenon that biases our attention towards novel locations against returning it back to previously attended locations. Eighteen subjects were examined in a visual detection task, in which a target appeared randomly following a nonpredictive spatial cue in the visual field. The eccentricities of the cues and targets were systematically manipulated from 5° to 30° with 5° increments. Results showed that response times to targets that appeared at cued locations were significantly slower than those at uncued locations for all stimulus eccentricities, demonstrating the IOR effects. However, response times at cued locations increased significantly when stimulus eccentricity shifted from 15° to 20°, leading to a much stronger IOR effect at more peripheral regions compared to central and perifoveal regions, indicating a functional dissociation between these two regions of the visual field. Possible neural mechanisms underlying this dissociation are discussed, and two attention systems modulating the two functional regions of the visual field are put forward to best account the present finding implicating in particular midbrain mechanism.     

Mindfulness and psychological well-being among black South African university students and their relatives

This study investigated the relationship between mindfulness and psychological well-being in a convenience sample of black South African students (n = 203) and their parents and other relatives (n = 204) (66.1% = female; age range 18–73). The students self-reported on their mindfulness on the Mindful Attention Awareness Scale and psychological well-being on the Satisfaction with Life Scale, the Positive and Negative Affect Schedule, Adult Trait Hope Scale and the Meaning in Life Questionnaire. A multivariate regression model was specified and analysed via structural equation modelling in Mplus 7.3. Results revealed that mindfulness scores strongly predicted elevated levels of meaning and positive affect, and lowered levels of negative effect, and were moderately strong predictors of life satisfaction and hope. The findings imply that mindfulness likely plays an important role in relation to the psychological well-being of cross-generational African culture community members.     

Cross-cultural effects on detecting multiple sources of driving hazard: Evidence from the deceleration detection flicker test

Collision rates in Malaysia are much higher than the UK; do these reflect poorer hazard perception skill or does exposure to hazardous events improve hazard detection ability? The deceleration detection flicker test (DDFT) was used to investigate the effect of experience and cross-cultural differences between Malaysian and UK drivers in their ability to detect the deceleration of a lead vehicle while simultaneously identifying any secondary hazards in side roads. Matched groups of participants with lower or higher levels of experience were recruited from the University of Nottingham in the UK and Malaysia. Malaysian drivers were significantly less accurate than UK drivers in detecting the deceleration of lead vehicles on urban roads, and significantly less accurate in detecting the presence of secondary hazards across all road types. Experienced drivers were significantly faster than novices in detecting decelerations of the lead vehicle, and were significantly more accurate in detecting the presence of secondary hazards. The study concludes that high exposure to hazardous events on the road in Malaysia does not yield expertise in this hazard perception task, although the DDFT does differentiate experience cross-culturally.     

语篇阅读理解中人物性格模型的建构

采用实时窗口阅读技术,通过操纵特征段落性质和屏蔽段落长度两个变量,探讨人物性格模型在语篇阅读中的建构和影响因素。在研究所用材料中,特征段落描述能反映主人公性格的典型行为或不能反映其性格的一般行为,使其与目标句分别形成冲突或无关关系,考察读者能否利用这些内隐式的行为描述建构人物的性格模型。同时,改变屏蔽段落长度,形成局部或整体联贯两种条件,考察不同联贯类型的影响作用。结果发现：在不论整体还是局部联贯条件下,读者均能利用内隐的行为描述建构人物性格模型,并能应用该模型预期人物的后续行为。     

Treatment Efficacy of Multiple Family Therapy for Chinese Families of Children with Attention Deficit Hyperactivity Disorder

The treatment efficacy of multiple family therapy (MFT) for Chinese families of children with attention deficit hyperactivity disorder (ADHD) has not been studied in the past. In this paper, the effect of MFT on different aspects of the lives of the parents in the experimental group (n = 61) was compared with the effect of only the psychoeducational talks on parents in the control group (n = 53). The results of a MANOVA have shown that by the time they reached the posttreatment phase, the parents who had completed the full 42 hours of the MFT program perceived their children's ADHD symptoms as being less serious and less pathological than they had originally thought compared to the parents in the control group. The effect of MFT on parent–child relationships, parenting stress, parental efficacy, hope, and perceived social support was statistically insignificant. Contributions and limitations of our study are discussed.