Role of stiffness in weight perception

Abstract:  Here, we focused on a load-on task to clarify the judgment mechanism for weight perception. We measured hand trajectory and surface electromyography to estimate time-varying stiffness and torque patterns in joints. Our results showed that the goal of learning motor skills under load-on tasks is to maintain the hand position, and that humans produce force with cocontraction and increasing stiffness levels according to the weight of an object. Finally, we examined whether stiffness is an effective parameter as an efferent signal for weight perception and found that stiffness plays an important role in weight perception.     

Gender,attachment, and relationship duration on cardiovascular reactivity to stress in a laboratory study of dating couples

Stress related to relationship events has been a strong predictor of cardiovascular reactivity. This four‐phase laboratory study used a multiple‐nested design to examine variations in diastolic blood pressure (DBP) and rate‐pressure product (RPP: pulse rate [PR] × systolic blood pressure [SBP]) as a function of stress appraisal using 33 college‐aged dating couples. Individual participants filled out questionnaires designed to assess the length of their relationships (couple‐level factor), gender and attachment styles (individual‐level factors); watched a film clip depicting relationship distress; discussed relationship problems; then received instruction for relaxation. Individuals’ self‐reported stress and negative affect levels (experimental phase‐level factors), DBP, SBP, and PR were also measured at each study phase. Hierarchical linear modeling analyses revealed that relationships with longer duration were associated with higher levels of DBP and RPP as perceived stress levels increased. Also, as perceived stress levels increased, men or individuals high in the anxiety dimension of attachment showed higher DBP and RPP reactivity, whereas individuals high in the avoidance dimension of attachment showed lower RPP reactivity. As the negative affect level increased, individuals high in the avoidance dimension of attachment showed lower RPP reactivity. Findings imply that under relationship stress, individuals high in avoidance or anxiety dimensions of attachment may be vulnerable to a range of physical symptoms, such as cardiovascular disease or hypertension.     

WHAT KIND OF PHILOSOPHER WAS LOCKE ON MIND AND BODY?

The wide range of conflicting interpretations that exist in regard to Locke's philosophy of mind and body (i.e. dualistic, materialist, idealistic) can be explained by the general failure of commentators to appreciate the full extent of his nominalism. Although his nominalism that focuses on specific natural kinds has been much discussed, his mind‐body nominalism remains largely neglected. This neglect, I shall argue, has given rise to the current diversity of interpretations. This paper offers a solution to this interpretative puzzle, and it attributes a view to Locke that I shall describe as nominal symmetry.