刺激放置朝向对返回抑制的影响:一项ERPs研究

返回抑制(inhibition of return, IOR)是指个体对出现在先前提示位置上的刺激反应更慢的现象。尽管大量ERPs研究发现呈现在线索化和非线索化位置上的靶刺激诱发的ERPs在250-300ms处存在一个稳定的差异(Nd250),但这一差异的方向却并不一致。本研究采用事件相关电位技术(Event-related Potentials, ERPs),结合经典的线索-靶子范式,考察刺激放置的朝向是否会影响到IOR中Nd250效应的极性。结果显示虽然刺激放置朝向并未有影响到Nd250的极性,却对早期P1成分的线索化效应的地形图分布有着显著的影响。这表明1）过往ERPs研究中的Nd250效应极性的不一致并非源于刺激放置朝向的作用;2）刺激的放置朝向会导致早期线索化效应(P1)在地形分布上出现差异。     

The latency complex: the dead hand of anti‐development

It is common knowledge that the same phenomena can be viewed in a variety of ways. This paper considers the implications of a constellation observed in some adult patients who have increasingly reminded the author of some of the children of latency age with whom he has also worked. In the literature these patients may also have been thought about in terms of ‘defences of the self’ (Fordham), patients who are ‘difficult to reach’ (Joseph), ‘psychic retreats’ (Steiner), and those who make ‘attacks on linking’ (Bion). They may equally be considered in terms of schizoid, narcissistic or borderline personalities, or as showing features on the autistic spectrum, such as mindlessness and extreme obsessionality. Writers such as Helene Deutsch with her concept of an ‘as‐if personality’, Winnicott with his ‘false self’, and Rosenfeld, discussing the split‐off parts of the personality in narcissistic patients, have also offered much to think about in their consideration of some of these phenomena. This paper proposes yet another vertex – the author's own imaginative conjecture – that is by no means mutually exclusive of any of these others.     

‘Clemency on the way to the gallows’: death,dreams and dissociation

The survivor of a decade of childhood sexual trauma and violence, perpetrated by a monstrous father, produced a series of dreams in the final year of a ten‐year analysis. They illuminated the ‘death drive’ beneath a lifelong preoccupation with dying and fantasies of submission to death, perpetuated by the promise of hoped‐for freedom from pain and release from a life of suffering. The initial dream involved the collapse of a team of white horses drawing him in a pillory cart to his own hanging for a crime he did not commit. It signified the collapse of a fragile psychological system based on his role as the ‘sacrificial lamb,’ protecting a (not so) innocent mother. The raw truth was now unconcealed: primal, violent, and terrifying dreams and affects emerged where he was now the murderous aggressor. His dreams would become primary agents for an instinctive, life‐giving authenticity to emerge, offering him clemency from the shattering repetitions of persecution and dissociation.     

The role of cognitive control mechanisms in selective attention towards emotional stimuli

The role of cognitive control mechanisms in reducing interference from emotionally salient distractors was investigated. In two experiments, participants performed a flanker task in which target-distractor affective compatibility and cognitive load were manipulated. Differently from past studies, targets and distractors were presented at separate spatial locations and cognitive load was not domain-specific. In Experiment 1, words (positive vs. negative) and faces (angry, happy or neutral faces), were used respectively as targets and distractors, whereas in Experiment 2, both targets (happy vs. angry) and distractors were faces. Findings showed interference from distractor processing only when cognitive load was high. The present findings indicate that, when targets and distractors are presented at different spatial locations, cognitive control mechanisms are involved in preventing interference from positive (Exp. 1) or negative distractors (Exp. 2). The role of stimulus valence and type is also discussed with regard to different patterns of interference observed.     

Racial Discrimination and Health Outcomes Among Racial/Ethnic Minorities: A Meta‐Analytic Review

In this meta‐analysis, the authors reviewed 105 studies on the relationships between racial discrimination and health outcomes among racial/ethnic minority Americans. The authors tested for moderator effects of measurement strategies, cultural factors, substance use, gender, and racial group differences. Findings indicate a statistically significant effect size between racial discrimination and health, with the largest effect for mental health and strongest for studies with multi‐item measures. En este metaanálisis, los autores revisaron 105 estudios sobre las relaciones entre la discriminación racial y los resultados para la salud entre americanos pertenecientes a minorías raciales o étnicas. Los autores examinaron los efectos moderadores de las estrategias de medición, los factores culturales, el uso de sustancias, el género y las diferencias entre grupos raciales. Los hallazgos indican un efecto de tamaño estadísticamente significativo entre la discriminación racial y la salud, con el máximo efecto observado en la salud mental y el más fuerte en estudios con mediciones múltiples.     

‘The Echo of a Thought in Sight’: Property Perception,Universals and Wittgenstein

Contemporary philosophers of perception, even those with otherwise widely differing beliefs, often hold that universals enter into the content of perceptual experience. This doctrine can even be seen as a trivial inference from the observation that we observe properties – ways that things are – as well as things. I argue that the inference is not trivial but can and should be resisted. Ordinary property perception does not involve awareness of universals. But there are visual (and aural) experiences which do involve determinate universals: following Wittgenstein, I call these ‘aspect experiences’. The common view of perceptual content effectively conflates aspect experiences with mere property perceptions. Wittgenstein’s later writings on the philosophy of psychology provide an alternative way to think about both aspects and properties. It also forms a contrast with Wittgenstein’s own early treatment of perception in the Tractatus, the doctrine of which is much closer to the contemporary norm among philosophers of perception. In seeing how Wittgenstein moved away from his early view, we can see how we might move away from that norm.     

Discontinuity in the enumeration of sequentially presented auditory and visual stimuli

The seeking of discontinuity in enumeration was recently renewed because Cowan [Cowan, N. (2001). The magical number 4 in short-term memory: A reconsideration of mental storage capacity. Behavioral and Brain Sciences, 24, 87–185; Cowan, N. (2005). Working memory capacity. Hove: Psychology Press] suggested that it allows evaluating the limit of the focus of attention, currently estimated at four items. A strong argument in favour of a general constraint of the cognitive system is that similar discontinuities should be observed in modalities different from the classic simultaneous presentation of visual objects. Recently, data were provided on tactile stimuli, but the authors diverged in their conclusion about the existence of such discontinuity [Gallace, A., Tan, H. Z., & Spence, C. (2006). Numerosity judgments for tactile stimuli distributed over the body surface. Perception, 35(2), 247–266; Riggs, K. J., Ferrand, L., Lancelin, D., Fryziel, L., Dumur, G., & Simpson, A. (2006). Subitizing in tactile perception. Psychological Science, 17(4), 271–272]. Following a similar rationale, our study aimed at evaluating discontinuity in the enumeration of auditory and visual stimuli presented sequentially. The clear and similar discontinuity observed in error rates, response times and given responses for both modalities favours the general capacity limit view, but also questions the size of this capacity, because the discontinuity occurred here at size 2. However, the masking of stimuli in sensory memory could not be entirely discarded.     

The attentional cost of inattentional blindness

When our attention is engaged in a visual task, we can be blind to events which would otherwise not be missed. In three experiments, 97 out of the 165 observers performing a visual attention task failed to notice an unexpected, irrelevant object moving across the display. Surprisingly, this object significantly lowered accuracy in the primary task when, and only when, it failed to reach awareness. We suggest that an unexpected stimulus causes a state of alert that would normally generate an attentional shift; if this response is prevented by an attention-consuming task, a portion of the attentional resources remains allocated to the object. Such a portion is large enough to disturb performance, but not so large that the object can be recognized as task-irrelevant and accordingly ignored. Our findings have one counterintuitive implication: irrelevant stimuli might hamper some types of performance only when perceived subliminally.     

Effects of within-class differences in sample responding on acquired sample equivalence

Two experiments examined whether acquired sample equivalence in many-toone matching was affected by variation in sample-response requirements. In each experiment, pigeons responded on either identical or different response schedules to the sample stimuli that occasioned the same reinforced comparison choice (i.e., to the within-class samples). Transfer-of-control tests were then conducted to determine acquired equivalence, or lack thereof, between these samples. In both experiments, there was minimal or no evidence of acquired sample equivalence when pigeons responded differently to the samples within each common-choice class. By contrast, transfer was observed if pigeons responded (a) identically to all sample stimuli, or (b) identically to samples within each common-choice class (viz., to samples that occasioned the same reinforced choice) and differently to samples from different classes (viz., to samples that occasioned different choices). These results may help to explain the recent lack of evidence for response membership in pigeons' acquired equivalence (Urcuioli, Lionello-DeNolf, Michalek, & Vasconcelos, 2006). They also raise questions about the functional sample stimuli and about possible interactions between acquired equivalence and acquired distinctiveness.