Response-specifying cue for action interferes with perception of feature-sharing stimuli

Perceiving a visual stimulus is more difficult when a to-be-executed action is compatible with that stimulus, which is known as blindness to response-compatible stimuli. The present study explored how the factors constituting the action event (i.e., response-specifying cue, response intention, and response feature) affect the occurrence of this blindness effect. The response-specifying cue varied along the horizontal and vertical dimensions, while the response buttons were arranged diagonally. Participants responded based on one dimension randomly determined in a trial-by-trial manner. The response intention varied along a single dimension, whereas the response location and the response-specifying cue varied within both vertical and horizontal dimensions simultaneously. Moreover, the compatibility between the visual stimulus and the response location and the compatibility between that stimulus and the response-specifying cue was separately determined. The blindness effect emerged exclusively based on the feature correspondence between the response-specifying cue of the action task and the visual target of the perceptual task. The size of this stimulus–stimulus (S–S) blindness effect did not differ significantly across conditions, showing no effect of response intention and response location. This finding emphasizes the effect of stimulus factors, rather than response factors, of the action event as a source of the blindness to response-compatible stimuli.     

Does temporal contiguity moderate contingency learning in a speeded performance task?

In four experiments, we varied the time between the onset of distracting nonwords and target colour words in a word–word version of the colour–word contingency learning paradigm. Contingencies were created by pairing a distractor nonword more often with one target colour word than with other colour words. A contingency effect corresponds to faster responses to the target colour word on high-contingency trials (i.e., distractor nonword followed by the target colour word with which it appears most often) than on low-contingency trials (i.e., distractor nonword followed by a target colour word with which it appears only occasionally). Roughly equivalent-sized contingency effects were found at stimulus-onset asynchronies (SOAs) of 50, 250, and 450 ms in Experiment 1, and 50, 500, and 1,000 ms in Experiment 2. In Experiment 3, a contingency effect was observed at SOAs of –50, –200, and –350 ms. In Experiment 4, interstimulus interval (ISI) was varied along with SOA, and learning was equivalent for 200-, 700-, and 1,200-ms SOAs. Together, these experiments suggest that the distracting stimulus does not need to be presented in close temporal contiguity with the response to induce learning. Relations to past research on causal judgement and implications for further contingency learning research are discussed.     

Conflict adaptation is reflected by response interference

The conflict monitoring theory suggests that the occurrence of conflict in previous trials leads to a reduction in interference in current trials through conflict adaption. The present study included two experiments that used a colour-based flanker task and a Stroop task in combination with a 2:1 stimulus-to-response mapping manipulation and a crossing of transition types (Previous trial type×Current trial type) with stimuli to investigate conflict adaption in relation to stimulus and response interference. The results demonstrate that response interference, but not stimulus interference, was reduced following both stimuli and response conflicts in previous trials. In contrast to some recent evidence, we conclude that conflict adaptation is limited to response interference.     

The effect of statistical learning on internal stimulus representations: Predictable items are enhanced even when not predicted

Statistical learning is the automatic and unconscious learning of environmental regularities and is a basic mechanism of learning in a variety of human perceptual and cognitive domains. Previous studies have mainly focused on the associative mechanisms of statistical learning. However, an unexplored question is whether the internal representations of individual stimuli are altered as their associations are learned. Using a temporal statistical learning paradigm, we examine this question across three experiments and find clear evidence that the internal representations of individual stimuli are differentially altered according to their degree of temporal predictability. These findings complement previous accounts of statistical learning and reveal an enriched mechanism of human learning, such that learning to associate items also enhances the representations of certain items relative to others.     

La substitution dans les études de représentations sociales : quel processus impliqué ?

This study of social representations aims at identifying the process involved in the responses produced with a substitution technique. Two alternative hypotheses are discussed: one that considers that substitution induces social comparison (Chokier and Moliner, 2006), the other suggesting that this technique leads to a reduction of normative pressures (Guimelli, 1998). In the research presented here, we studied the social representations of Drug addicts (in the tolerance towards the use of cannabis) and of Unemployed people, in order to compare the results with those obtained by Chokier and Moliner (2006) about security. With a specific population of students, these objects allowed us to manipulate two levels of distance to the object of representation. Concerning the technique of substitution, three levels of distance to the reference group (French people in general, Young people, Students) were combined into questionnaires with four types of instructions: standard, substitution, pro- and counter-normative. The PCA highlights a Guttman effect, which indicating that the responses produced with standard instruction are less normative than the responses produced with the substitution instruction to Young people. These results invalidate an explanation in terms of effect Primus Inter Pares. Globally, the results mainly show that the more the distance to the object is low and the distance to the reference group is high, the more the responses produce in substitution are seen as pro-normative and near from those produced with standard instruction. More specifically, we identified a number of inconsistencies with regard to what one could expect from an explanation of the phenomena in terms of personal versus social identity. As regards the representation of Unemployed people, the more the participants are closed to the reference group, the more the responses produced with an instruction of auto-valorization (pro-normative) are closed to those produced in substitution. However, on one hand, this result is observed only with the representation of Unemployed people, and, on the other hand, a social comparison explanation would suppose that the participants perceived the group of French people in general as homogeneous and identified themselves to this group at the same level than to the two other reference groups, which is unlikely. Finally, these results lead us to conclude that the substitution does not induce social comparison (Chokier and Moliner, 2006), but more probably reduction of normative pressures (Guimelli, 1998). It thus suggests that the study of masking effects through a substitution technique should take into account two parameters: distance to the object and distance to the reference group.     

人际信任与合作的培养:基于信任和公共品博弈的实验研究

研究运用经济行为学的博弈实验法,探索了不同人际信任和合作的培养模式的效果问题。实验一和实验二分别采用两人信任博弈和六人公共品博弈实验范式,探讨了替代强化、直接强化和对照组等不同培养模式下的信任和合作关系变化情况。研究结果显示:1、直接强化组的培养效果好于替代强化组; 2、从实验范式角度而言,两人信任博弈范式下的培养效果优于六人公共品博弈范式; 3、相比于直接强化组而言,替代强化组的培养效果不受实验范式和实验情境的影响,具有跨实验情境的一致性和稳定性。因此,在人际信任和合作关系的培养过程中,相比于直接强化模式更容易受时空的限制和实验效应的影响,观察学习等替代强化的模式更具有可行性及推广性。     

Dissimilarity cumulation theory in smoothly connected spaces

This is the third paper in the series introducing the Dissimilarity Cumulation theory and its main psychological application, Universal Fechnerian Scaling. The previously developed dissimilarity-based theory of path length is used to construct the notion of a smooth path, defined by the property that the ratio of the dissimilarity between its points to the length of the subtended fragment of the path tends to unity as the points get closer to each other. We consider a class of stimulus spaces in which for every path there is a series of piecewise smooth paths converging to it pointwise and in length; and a subclass of such spaces where any two sufficiently close points can be connected by a smooth “geodesic in the small”. These notions are used to construct a broadly understood Finslerian geometry of stimulus spaces representable by regions of Euclidean n-spaces. With an additional assumption of comeasurability in the small between the canonical psychometric increments of the first and second kind, this establishes a link between Universal Fechnerian Scaling and Multidimensional Fechnerian Scaling in Euclidean n-spaces. The latter was a starting point for our theoretical program generalizing Fechner’s idea that sensation magnitudes can be computed by integration of a local discriminability measure.