Type-based associations in grapheme-color synaesthesia revealed by response time distribution analyses

Determining the nature of binding in grapheme-color synaesthesia has consequences for understanding the neural basis of synaesthesia and visual awareness in general. We evaluated type- and token-based letter-color binding using a synaesthetic version of the object-reviewing paradigm. Although mean response times failed to reveal any significant differences between synaesthetes and control participants, RT analyses with ex-Gaussian distributions revealed that the response facilitation in the synaesthesia group reflected type representations exclusively, while response facilitation in the control group, who learned letter-color associations, was dominated by token representations. Thus, letter-color associations in associator synaesthetes are type-based, and do not involve binding to object tokens, consistent with their subjective reports. Contrary to recent studies that failed to find differences between synaesthetes and non-synaesthetes with behavioral measures, response time distribution analyses indicate that color sensations in synaesthetes are not simply the extreme form of normal letter-color associations, and cannot be attributed to demand characteristics.     

Effects of facial expression and gaze direction on approach–avoidance behaviour

Humans must coordinate approach–avoidance behaviours with the social cues that elicit them, such as facial expressions and gaze direction. We hypothesised that when someone is observed looking in a particular direction with a happy expression, the observer would tend to approach that direction, but that when someone is observed looking in a particular direction with a fearful expression, the observer would tend to avoid that direction. Twenty-eight participants viewed stimulus faces with averted gazes and happy or fearful expressions on a computer screen. Participants were asked to grasp (approach) or withdraw from (avoid) a left- or right-hand button depending on the stimulus face's expression. The results were consistent with our hypotheses about avoidance responses, but not with respect to approach responses. Links between social cues and adaptive behaviour are discussed.     

Timing of bimanual alternating finger-tapping sequences in adolescents with mental retardation: a pilot study

We examined differences between the synchronization and self-pacing tasks using repetitive tapping with alternate hands. 9 adolescents with mental retardation made faster and more variable movements on the self-pacing task than on the synchronization task at target intervals of 400 and 800 msec. This suggests that they were able to coordinate the timing of individual responses with individual stimuli on the synchronization task but on the self-pacing task they controlled the timing by memory or generation or setting of an incorrect timer rate.     

Practice effects on decreasing and increasing force-control during periodic isometric movements of the index finger

The present study examined whether improvement in control while decreasing force to achieve a lower force target would be facilitated by comparison of performance while increasing force to achieve a higher force target. Participants practiced control of isometric force and timing during a unimanual force production task cycling between 5 and 10% of maximum voluntary contraction with a target interval of 500 msec. Although errors and variability of both peak and valley forces and interval decreased during early practice, the valley force was still more inaccurate and variable than the peak force in the final practice. Variabilities of both forces did not decrease when the valley force was synchronized with an audible metronome pulse but did decrease when the peak force was synchronized with it.     

Effects of force levels on error compensation in periodic bimanual isometric force control

ABSTRACT The authors examined whether force level interacts with the presence or absence of vision in bimanual force control. Participants produced periodic isometric forces such that the sum of the 2 finger forces was the target force under 4 force levels cycling between lower levels (5-40%) of maximum voluntary contraction with an interval of 1000?ms. Without vision, the correlation between the 2 finger forces was strongly positive over all force levels. However, with vision the correlation changed from negative to positive with force level. The result with vision indicated that the strategy of the bimanual force control changed from force error compensation to force coupling and the available redundancy thus decreased with an increase in force.     

A General Model of Preventive and Interventive Self‐Control

The field of self‐control has witnessed an unprecedented boom, not least due to the immense implications of successful and unsuccessful self‐control for people’s lives. However, successful and unsuccessful self‐control can take many different forms, and many conceptual problems have been raised as to what self‐control is about and how to best study it. Integrating different literatures, we provide a general model of self‐control which distinguishes between preventive (i.e., anticipatory) and interventive (i.e., momentary) forms of self‐control. The proposed Preventive‐Interventive Model (PI‐Model) of Self‐Control combines seven basic components: preventive strategies, desire, conflict, control motivation, volition, opportunity constraints, and behavior enactment. The resulting taxonomy helps to distinguish self‐control from standard motivational processes, to define the concept of temptation, and to identify different types of self‐control failure including self‐monitoring failure, motivational self‐control failure, and volitional self‐control failure. Further, the model helps to outline five broad mechanisms through which people may be able to proactively boost self‐control success.     

Lateralization of bilateral transfer of visuomotor information in right-handers and left-handers

The author examined the lateralization of transfer of visuomotor information between the right and left hands during unimanual finger-tapping sequences with visual feedback. The finger-tapping task consisted of a target peak force of 2 N and a target intertap interval of 500 ms. Twenty right-handed and 10 left-handed participants performed the motor task, with 3 transfer trials following 3 practice trials. The author observed positive transfers from the left to the right hand for right-handers but the opposite direction of positive transfers for left-handers. However, left-handers showed a less variable peak force than right-handers did. The author discusses left-handers' interhemispheric information processing.     

The Mediating Effect of Financial Motives in the Association between Entrepreneurial Experience and Subjective Well-Being: Evidence from Japan

This study investigates the relationship between entrepreneurial experience and subjective well-being. Using an original survey on subjective well-being, entrepreneurial experience, level of wealth (inferred from observed variables of income, cash, and assets), and personal attributes of 10,001 individuals in Japan, we examine the factors that mediate the association between entrepreneurial experience and subjective well-being. We measure entrepreneurial experience as an individual’s experience in funding, owning, and running a corporation. We consider the mediating effect of the level of wealth on subjective well-being because entrepreneurial well-being is associate with wealth derived from income, cash, and assets. Our results provide no significant evidence that individuals with entrepreneurial experience have higher subjective well-being. However, we find a positive indirect effect of entrepreneurial experience on subjective well-being through wealth and a negative indirect effect through debt. The findings of this study indicate the importance of considering the mediating effect of financial motives in entrepreneurial well-being.