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Altenhoff: Perceiving Soft Tissue Break Points in the Presence of Friction

Perceiving Soft Tissue Break Points in the Presence of Friction

Tuesday, April 29th at 10:00am
Brackett 419

Committee: Dr. Chris Pagano (chair), Dr. Tim Burg, Dr. Ben Stephens, Dr. Rich Pak

Abstract: In minimally invasive surgery (MIS), surgeons face several perceptual challenges due to the remote interaction with the environment, such as distorted haptic feedback through the instruments due to friction produced from the rubber trocar sealing mechanisms at the incision site. As a result, surgeons sometimes unintentionally damage healthy tissues during MIS due to excessive force. Research has demonstrated that useful information is available in the haptic array of soft tissues, which allows novices to successfully perceive the penetration distance remaining until a material will fail based on displacement and reactionary forces of simulated tissues using a haptic invariant, Distance-to-Break (DTB). Attunement and calibration training will be used in the current study to investigate whether observers are able to identify material break points in nonlinear compliant materials through haptic force application, while ignoring haptic stimulation not lawfully related to the properties specifying DTB, including friction. A pretest, feedback, posttest, and transfer-of-training phase design will be used, allowing participants to probe four virtually simulated materials at varying levels of friction: no friction, low friction, and high friction in the first experiment, and pull the simulated tissues in the second experiment to investigate if perception of DTB generalizes to other tasks used in MIS.

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HFES Student Chapter Guest Speaker: Dr. Chris Wickens on the role of effort in choice, safety, and healthcare

Chris Wickens will be speaking to Clemson HFES on “the role of effort in choice, safety, and healthcare” via Skype at our second HFES Month event! Come hear this talk and enter your name in a drawing to win an HF/E prize. Snacks will be provided.

WHEN: April 11th at 1:00pm
WHERE: Brackett 214

RSVP HERE (RSVP by April 8th)

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HFES Kickoff Scavenger Hunt!

Join us in a HF/E scavenger hunt. Sign up in teams no larger than 4 people and compete to show off your HF knowledge and win gift cards! Also, officer nominations will begin.

WHEN: April 4th at 1:30 pm
WHERE: Starting at McAdams 226

RSVP HERE

https://docs.google.com/forms/d/17Vvz5lEgjG9Pna8apnqcGToPsoGRA4K4kw00ruF0zFY/viewform

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Wilson: ASSESSING THE BITE COUNTER AS A WEIGHT LOSS TOOL

ASSESSING THE BITE COUNTER AS A WEIGHT LOSS TOOL on Tuesday, April 8, 2014, in Brackett Hall, Room 419, at 1030 am.
ABSTRACT

Obesity is a growing health concern throughout the world. Health risks associated with obesity such as diabetes and heart disease result in obesity costing us over $170 million annually. Self-monitoring of Energy Intake (EI) is a critical element of a successful weight loss plan; however current methods to monitor EI are cumbersome and prone to under reporting. The primary purpose of the study was to develop and test an experimental diet protocol based on user feedback from the Bite Counter. A secondary purpose was to examine if this protocol would affect meaningful weight loss by device users. Data were collected from 30 participants (15 control) in a study where Bite Counter feedback was used to titrate daily bite count goals in order to meet a 1 to 2 pound per week weight loss goal measured against the control group which was only given weight loss literature. 77% of our participants were able to use the device to self-monitor a majority of the eating activities. Although weight loss was higher in the Bite Counter group, we determined that a diet protocol based solely on using the Bite Counter did not produce statistically significant weight loss over the ten-week study period. The Bite Counter was able to help the control group sustain their weight loss throughout the entire study period. The study determined that aggressive screening measures during study uptake is needed in order to ensure the recruitment of participants who are likely to complete future studies. User profile personas were developed to assist future researcher identify and classify users as successful or unsuccessful candidates for losing weight using the Bite Counter.

Committee Chair: Dr. Eric Muth
Committee Members: Dr. Adam Hoover and Dr. Patrick Rosopa

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HFDG: Is genetics the key?? … Individual differences in the design of interfaces and training programs

Is genetics the key?? … Individual differences in the design of interfaces and training programs
Dr. Ericka Rovira

Place: 419 Brackett Hall
Time: 1:00-2:00 pm Friday, March 28

(note, this will be a teleconferenced presentation)

Abstract: Human performance may be adversely affected when operators interact with highly reliable but imperfect systems. To date, models of human automation interaction emphasize how much authority the human or the machine should have at different decision making stages. Of particular interest is how human automation interactions are affected when the automated support tool is imperfect. The current research addresses types of human automation interaction mechanisms that may reduce performance decrements associated with imperfect automation. Results investigating contextual automation and automation etiquette will be presented. Additionally, optimizing human performance often requires assessment at the individual level because it provides an understanding of how individual variability contributes to operational performance. Molecular methods have been used to examine the genetic basis of basic cognitive function (Greenwood & Parasuraman, 2003; Posner et al., 2007). Individual differences in situation awareness and decision making in operational environments likely involve variation in cognitive processes of visual attention, working memory, and spatial attention. Research examining the utility and viability of using the allelic association method as a neuroergonomics approach that examines brain function in relation to operational tasks will be presented. This will pave the way for further theoretical progress in learning about the basis of individual differences in cognition and in human factors applications for training and interface design.

Dr. Ericka Rovira. She is an Associate Professor in the Engineering Psychology program at the United States Military Academy in West Point, NY. Dr. Rovira received a B.S. in Engineering Psychology and Biomedical Engineering from Tufts University, Medford, MA (2000) and a Ph. D. in Applied Experimental Psychology from The Catholic University of America, Washington, DC (2006), under the direction of Dr. Raja Parasuraman. Also, she is currently the president-elect of APA Division 21 (Applied Experimental and Engineering Psychology).

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Nathan Klein dissertation defense

Nathan Klein
Dissertation Defense
Understanding and Improving Pedagogical Aspects of a General Education Eportfolio
Chair: Benjamin Stephens
Committee: Lee Gugerty, Fred Switzer, and Joel Greenstein
Monday, March 24, 2014 at 12:30pm Brackett 214

The goal of this research was to examine general education eportfolio components that may help improve student learning outcomes. A general education eportfolio is essentially a website created by a student, who selects, links, and reflects upon artifacts they have created in order to demonstrate their competency in the various domains of higher education, e.g. social science, mathematics, and natural science. This dissertation research combined and extended previous research by Klein et al. (2011) into two studies. The first study employed a factorial design manipulating the type of reflective activity required for an eportfolio and the type of eportfolio support provided. The second study manipulated the number of artifacts used during reflection. The main outcome variables were student competency, metacognitive accuracy, and subjective experiences. Support, reflective activity, and an additional artifact were each expected to improve the outcome measures. Support and activity were also expected to produce a synergistic interactive effect. Reflective activity only had a marginal impact on competency, whereas eportfolio support was found to cause significant improvements in all of the outcome measures. There was a trend for a stronger effect of mentoring in eportfolios with rationale activities for social science competency. The second experiment did not detect any differences in outcomes resulting from using two artifacts compared to using one. This research informs educators of best practices in eportfolio program design at the general education level for improving learning outcomes in college students.

Keywords: eportfolio, learning, metacognition, reflection, support, general education

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Brock Bass Thesis defense 12/16

Faces as Ambient Displays: Assessing the Attention-Demanding Characteristics of Facial Expressions

Thesis Defense

Dr. Richard Pak (Advisor), Dr. Leo Gugerty, Dr. Christopher Pagano

Ambient displays are used to provide information to users in a non-distracting manner. The purpose of this research was to examine the efficacy of facial expressions as a method of conveying information to users in an unobtrusive way. Facial expression recognition requires very little if any conscious attention from the user, which makes it an excellent candidate for the ambient presentation of information. Specifically, the current study quantified the amount of attention required to decode and recognize various facial expressions. The current study assessed the attention-demanding characteristics of facial expressions using the dual-task experiment paradigm. Results from the experiment suggest that Chernoff facial expressions are decoded with the most accuracy when happy facial expressions are used. There was also an age-effect on decoding accuracy; indicating younger adults had higher facial expression decoding performance compared to older adults. The observed decoding advantages for happy facial expressions and younger adults in the single-task were maintained in the dual-task. The dual-task paradigm revealed that the decoding of Chernoff facial expressions required more attention (i.e., longer response times and more face misses) than hypothesized, and did not evoke attention-free decoding. Chernoff facial expressions do not appear to be good ambient displays due to their attention-demanding nature.

1 pm, Monday December 16th, 419 Brackett

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Drew Link Live at HFDG – 11/22/13

This week at HFDG

Who: Drew Link
Where: Brackett 419, this Friday at 2.30p
What: Dissertation plan and discussion

From Lee’s lab, Drew will be talking about research leading up to his current proposal
for a dissertation topic. The general research is on adaptive decision making in healthcare from a patient perspective. He is interested in studying variables that deal with how patients gather information regarding health topics online and how conditions (either of the individual or environment) may affect their ability or willingness to adapt their strategies. Drew will be presenting several potential study designs and will discuss potential considerations for the study.

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Cartee: The Effects of Reminder Distinctiveness and Anticipatory Interval on Prospective Memory

Thesis proposal

ABSTRACT: Prospective memory (PM) failures (or failures to remember a future intention) can result in a wide range of negative consequences. The use of reminders has been shown to improve the rate of PM successes. The current study aims to examine the effectiveness of reminders based on their type (text or picture) and their timing. We hypothesize that successful PM performance will be maintained over longer anticipatory intervals when paired with picture reminders rather than with simple text reminders because of their inherent distinctiveness. Prior research has shown increased memory for PM intentions when distinctiveness was high.

Committee: Rich Pak (chair), Patrick Rosopa, Paul Merritt
Wednesday, November 20th at 12:30pm in Brackett 414.

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Stephanie Whetsel Borzendowski’s dissertation proposal

Stephanie Whetsel Borzendowski’s dissertation proposal is scheduled for Tuesday, November 26 at 9:00 am in Brackett 419.

Encouraging the Appropriate Use of High Beam Headlamps: An Application of the TPB

Drivers typically underuse their high beam headlamps at night even under ideal conditions (i.e., no leading, following, or oncoming vehicles). One explanation for this is a lack of knowledge regarding both the magnitude of visibility problems at night and the benefits that high beams provide. The purpose of the present study is to design and evaluate an educational intervention that is based on the Theory of Planned Behavior (TPB) that targets a more appropriate reliance on high beams. The TPB provides a framework for understanding how interventions may lead to changes in intentions and/or behavior. Study 1 will identify salient beliefs about high beams and determine the factor(s) that best predict intentions to use high beams. This information will inform the design of the intervention that will be evaluated in Study 2. Half of the participants who receive the intervention in Study 2 will form implementation intentions about the conditions under which they plan to use their high beams; it is expected that these participants will report using their high beams more often. I hypothesize that the participants who receive the intervention, particularly those who form implementation intentions, will report using their high beams more often, will be observed using their high beams more often during a short on-road drive, and have greater knowledge of the visibility benefits provided by high beams.

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