Exploring the nonlinear relationship between challenge stressors and employee voice: The effects of leader–member exchange and organisation-based self-esteem

This study demonstrates how challenge stressor, a job demand that can bring potential gains for employees, influences voice, a change-oriented behaviour challenging the status quo. Specifically, we develop and test an inverted U-shaped relationship that integrates social exchange theory and the framework of resource allocation. Using data collected from 204 employees in Eastern China, we find that the U-shaped relationship between challenge stressor and voice is only emerged at low levels of leader–member exchange. At high levels of leader–member exchange the relationship between challenge stressor and voice is U-shaped. Furthermore, the interactive effect of challenge stressor and leader–member exchange on voice behaviour is mediated by organisation-based self-esteem. The findings of this study have important implications for stress and voice literature.     

Do infants perceive the social robot Keepon as a communicative partner?

This study investigates if infants perceive an unfamiliar agent, such as the robot Keepon, as a social agent after observing an interaction between the robot and a human adult. 23 infants, aged 9–17 month, were exposed, in a first phase, to either a contingent interaction between the active robot and an active human adult, or to an interaction between an active human adult and the non-active robot, followed by a second phase, in which infants were offered the opportunity to initiate a turn-taking interaction with Keepon.The measured variables were: (1) the number of social initiations the infant directed toward the robot, and (2) the number of anticipatory orientations of attention to the agent that follows in the conversation. The results indicate a significant higher level of initiations in the interactive robot condition compared to the non-active robot condition, while the difference between the frequencies of anticipations of turn-taking behaviors was not significant.     

Muscle fatigue as an investigative tool in motor control: A review with new insights on internal models and posture–movement coordination

Muscle fatigue is a common phenomenon experienced in everyday life which affects both our force capacity and movement production. In this paper, we review works dealing with muscle fatigue and motor control and we attempt to demonstrate how the Central Nervous System deals with this particular state. We especially focus on how internal models – neural substrates which can estimate the current state as well as the future state of the body – face this internal perturbation. Moreover, we show that muscle fatigue is an interesting investigative tool in understanding the mechanisms involved in posture–movement coordination.