Timothy Gifford

Effect of Interactions between a Child and a Robot on the Imitation and Praxis Performance of Typically Devloping Children and a Child with Autism: A Preliminary Study:

Interactions between a robot and a child (robot-child interactions) provide a unique context to engage children in whole body movements through a reciprocal imitation game. The effects of a novel, 8-session, robot-child interaction protocol on the imitation and praxis skills of 15 typically developing children and one child with autism between 4 and 7 years of age were examined. A quasi-experimental observational comparison of pretest and posttest performance was conducted. A task-specific robot imitation test and a standardized praxis measure were coded for changes in imitation and praxis errors at pretest and posttest. All children showed improvements in task-specific imitation and generalized praxis. Interpretation is limited by the lack of a control group. These findings serve as a foundation for further investigation of robot-child interactions as a potential training tool for children with dyspraxia.

The Effects of Rhythm and Robotic Interventions on the Imitation/Praxis, Interpersonal Synchrony, and Motor Performance of Children with Autism Spectrum Disorder (ASD): A Pilot Randomized Controlled Trial

We assessed the effects of three interventions, rhythm, robotic, and standard-of-care, on the imitation/praxis, interpersonal synchrony, and overall motor performance of 36 children with Autism Spectrum Disorder (ASD) between 5 and 12 years of age. Children were matched on age, level of functioning, and services received, prior to random assignment to one of the three groups. Training was provided for 8 weeks with 4 sessions provided each week. We assessed generalized changes in motor skills from the pretest to the posttest using a standardized test of motor performance, the Bruininks-Oseretsky Test of Motor Proficiency, 2nd edition (BOT-2). We also assessed training-specific changes in imitation/praxis and interpersonal synchrony during an early and a late session. Consistent with the training activities practiced, the rhythm and robot groups improved on the body coordination composite of the BOT-2, whereas the comparison group improved on the fine manual control composite of the BOT-2. All three groups demonstrated improvements in imitation/praxis. The rhythm and robot groups also showed improved interpersonal synchrony performance from the early to the late session. Overall, socially embedded movement-based contexts are valuable in promoting imitation/praxis, interpersonal synchrony, and motor performance and should be included within the standard-of-care treatment for children with ASD.

The effect of a Spanish virtual pain coach for older adults: a pilot study.

OBJECTIVE To pilot test the effects of a virtual pain coach on ambulatory Spanish-speaking older adults with pain from osteoarthritis. METHODS A randomized, controlled design was used. Eighteen Spanish-speaking older adults were randomly assigned to the virtual pain coach and pain communication education group, or to the pain communication education-only group. All participants viewed the pain communication videotape. Participants in the virtual pain coach group practiced talking about their osteoarthritis pain with the virtual pain coach. Immediately after the respective intervention, participants had their ambulatory medical visit. Pain intensity and pain interference with activities were measured with the Brief Pain Inventory, and depressive symptoms were measured with the Beck Depression Inventory II at baseline and 1 month later. RESULTS No significant group difference emerged for pain intensity, pain interference with activities, or depressive symptoms 1 month later. More older adults in the virtual pain coach group reported a change from nonuse to use of opioids at 1 month, 50% vs 0% of the education only group, Fishers exact test, P = 0.023. CONCLUSIONS  Preliminary data indicate that the Spanish virtual pain coach might assist Spanish-speaking older adults to talk with their practitioner about their osteoarthritis pain and obtain opioid treatment changes, but that pain and depressive symptoms continue unchanged 1 month later. Additional refinement and testing is required for the Spanish-speaking virtual pain coach to determine acceptability and outcomes for assisting Spanish-speaking older adults to communicate about their pain with their primary care practitioner.

Crowd Guidance in Building Emergencies: Using Virtual Reality Experiments to Confirm Macroscopic Mathematical Modeling of Psychological Variables

A general challenge during a building emergency evacuation is guiding crowd to the best exits, given potential hazards and blockages due to high density use. Although computer simulation programs such as FDS+Evac allow researchers to evaluate various guidance policies under different circumstances, computational complexity limits their use during an actual emergency. A second limitation of such programs currently available is that they can only model certain psychological variables that affect evacuation. We suggest two innovations to address these difficulties. First, using macroscopic models, mathematical techniques can allow for rapid optimization of guidance that could eventually be used to provide real-time use during emergencies. Second, we conduct virtual reality experiments using human participants to provide confirmation of our models, and offer insights into how psychological factors not yet available in FDS+Evac will affect evacuation outcomes. Results of an initial VR experiment are presented.

A dynamic system for controlling the head movement and gaze of virtual characters

Creating virtual characters with natural movements is a challenging problem. Users are very aware of how people in general move when interacting based on a lifetime of experience. Unintentionally unnatural movements can adversely affect the experience of the participant. Computationally intensive techniques for calculating dynamic movements can cause the system to run slowly, reducing the frame rate or the performance of the avatar within the simulation. Our system provides a simple implementation that enables precise individual control of multiple avatars.