Daniel Lewkowicz

• PhD
• Human Factor Specialist at Human Design Group, Toulouse, France

A method and system for monitoring a state of consciousness of an operator in an aircraft cockpit includes at least one image acquisition module for acquiring images of the operator, a detection module for detecting movements of the body of the operator from the images, a determination module for determining a movement feature of the body of the op...

Planning a sequence of two motor elements is much more than concatenating two independent movements. However, very little is known about the cognitive strategies that are used to perform fluent sequences for intentional object manipulation. In this series of studies, the participants' task was to reach for and pick to place a wooden cylinder to set...

Aims: The aim of the study was to compare emotional information processing in patients with severe alcohol use disorder in short-term abstinence (<1 month) and long-term abstinence (at least 6 months to 9 years) with control participants. Methods: We studied the variation in pupil diameter during the presentation of pictures of human interactions a...

The understanding of concepts related to objects are developed over a long period of time in infancy. This study investigates how physical constraints and changes in visual perception impact on both the sensorimotor development for gaze control, as well as the perception of features of interesting regions in the scene. Through a progressive series...

Psychologists report that infants rely on shape rather than colour for object recognition, differentiation and generalisation for both verbal and non-verbal tasks. In this paper we propose a mechanism for object generalisation, based on inductive inference and differentiation using visual along with non-visual information obtained through the manip...

During infancy, infants spend a lot of time visually exploring the scene around them. Over the first year of life, the level of detail that can be perceived visually increases significantly. In this study, the ability to perceive areas of interest w.r.t. human developmental change in vision, specifically acuity and field of view over the first year...

In humans, repeated exposure to the effects of events can lead to anticipation of these effects. This behaviour has been observed in infants from as young as 3 months old. During infant experiments, the infants have been observed to predict either by pre-saccadic movements or reach actions according to the expected future outcome of the event. Even...

As social animals, it is crucial to understand others’ intention. But is it possible to detect social intention in two actions that have the exact same motor goal? In the present study, we presented participants with video clips of an individual reaching for and grasping an object to either use it (personal trial) or to give his partner the opportu...

In 1984, von Hofsten performed a longitudinal study of early reaching in infants between the ages of 1 week and 19 weeks. This paper proposes a possible model using excitation of various subsystems to reproduce the longitudinal study. The model is then implemented and tested on an iCub humanoid robot, and the results compared to the original study....

In 1984, von Hofsten performed a longitudinal study of early reaching in infants between the ages of 1 week and 19 weeks. This paper proposes a possible model using excitation of various subsystems to reproduce the longitudinal study. The model is then implemented and tested on an iCub humanoid robot, and the results compared to the original study....

In 1984, von Hofsten performed a longitudinal study of early reaching in infants between the ages of 1 week and 19 weeks. This paper proposes a possible model using excitation of various subsystems to reproduce the longitudinal study. The model is then implemented and tested on an iCub humanoid robot, and the results compared to the original study....

Aims The aim of the study was to compare emotional information processing in patients with severe alcohol use disorder in short-term abstinence (<1 month) and long-term abstinence (at least 6 months to 9 years) with control participants. Methods We studied the variation in pupil diameter during the presentation of pictures of human interactions as...

We present here a toolbox for the real-time motion capture of biological movements that runs in the cross-platform MATLAB environment (The MathWorks, Inc., Natick, MA). It provides instantaneous processing of the 3-D movement coordinates of up to 20 markers at a single instant. Available functions include (1) the setting of reference positions, are...

The present study presents a significant advancements in motor control technology: we present one of the first study during which the gaze and the 3D hand kinematics of two agents are collected in synchrony. In a very simple sequential collaborative pick and place task, we manipulated the information conveyed by the eyes of one of the two partners...

The aim of my PhD thesis was to participate in the construction of a new humanoid robot that can sustain intuitive interactions with humans through observation and imitation. As such, I conducted a series of experimental studies in young adults to better characterize the kinematic properties of those arm movements performed during motor and social...

Optimal control models of biological movements are used to account for those internal variables that constrain voluntary goal-directed actions. They, however, do not take into account external environmental constraints as those associated to social intention. We investigated here the effects of the social context on kinematic characteristics of seq...

Motor imagery is defined as a dynamic state during which the representation of a given motor act is internally rehearsed without overt motor output. Some evidence in experimental psychology has suggested that imagery ability is crucial for the correct understanding of social intention. The present study was conducted first to confirm that the natur...