Myoelectric Control Systems for Upper Limb Wearable Robotic Exoskeletons and Exosuits-A Systematic Review.

In recent years, myoelectric control systems have emerged for upper limb wearable robotic exoskeletons to provide movement assistance and/or to restore motor functions in people with motor disabilities and to augment human performance in able-bodied individuals. In myoelectric control, electromyographic (EMG) signals from muscles are utilized to implement control strategies in exoskeletons and exosuits, improving adaptability and human-robot interactions during various motion tasks. This paper reviews the state-of-the-art myoelectric control systems designed for upper-limb wearable robotic exoskeletons and exosuits, and highlights the key focus areas for future research directions. Here, different modalities of existing myoelectric control systems were described in detail, and their advantages and disadvantages were summarized. Furthermore, key design aspects (i.e., supported degrees of freedom, portability, and intended application scenario) and the type of experiments conducted to validate the efficacy of the proposed myoelectric controllers were also discussed. Finally, the challenges and limitations of current myoelectric control systems were analyzed, and future research directions were suggested.

An experimental examination of the perceptual paradox surrounding police canine units.

Objectives: To experimentally examine public perceptions of police canine units. Methods: As part of the between-subjects paradigm, participants were randomly assigned to view and rate an image of a police officer either with a police dog (i.e., as a police canine unit) or alone on eight dimensions: aggression, approachability, fairness, friendliness, intimidation, professionalism, respectfulness, and trustworthiness. Results: The analyses reveal that the officer was perceived more negatively when presented with a police dog than when presented alone. Conclusions: Police dogs play a multifaceted role in policing, including in crime control and public relations. In addition to their many functions, police canine units can also elicit many perceptual effects.

The use of personal protective equipment (PPE) by police during a public health crisis: An experimental test of public perception.

Objectives: To experimentally evaluate the effects of personal protective equipment (PPE) on participants' perceptions of police during the COVID-19 pandemic. Methods: As part of the experimental paradigm, participants were randomly assigned to read a fictitious news article about the utility of PPE (i.e., pro-PPE, anti-PPE, or neutral), and then rate images of a police officer using different items of PPE (i.e., masks, goggles, face shields, and/or medical gloves) along eight dimensions. Results: The analyses reveal that participants overwhelmingly perceived the use of PPE as both important and beneficial, regardless of condition. The analyses also reveal that the use of PPE impacted perceptions of the pictured officer, but that the specific perceptual effects of such PPE varied by the item used. Conclusions: Police worldwide have attempted to reduce the risks associated with COVID-19 by using PPE. In addition to functional benefits, many items of PPE also present perceptual benefits.

Re-assessing measurement error in police calls for service: Classifications of events by dispatchers and officers.

Police calls for service are an important conduit by which officers and researchers can obtain insight into public requests for police service. Questions remain, however, about the quality of these data, and, particularly, the prevalence of measurement error in the classifications of events. As part of the present research, we assess the accuracy of call-types used by police dispatchers to describe events that are responded to by police officers. Drawing upon a sample of 515,155 calls for police service, we explore the differences among initial call-types, cleared call-types, and crime-types as documented in crime reports. Our analyses reveal that although the majority of calls for service exhibit overlap in their classifications, many still exhibit evidence of misclassification. Our analyses also reveal that such patterns vary as a function of call- and crime-type categories. We discuss our findings in light of the challenges of the classification process and the associated implications.