Matching Items (21)
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- All Subjects: perception
- Creators: School of Art
Description
Dexterous manipulation is a representative task that involves sensorimotor integration underlying a fine control of movements. Over the past 30 years, research has provided significant insight, including the control mechanisms of force coordination during manipulation tasks. Successful dexterous manipulation is thought to rely on the ability to integrate the sense of digit position with motor commands responsible for generating digit forces and placement. However, the mechanisms underlying the phenomenon of digit position-force coordination are not well understood. This dissertation addresses this question through three experiments that are based on psychophysics and object lifting tasks. It was found in psychophysics tasks that sensed relative digit position was accurately reproduced when sensorimotor transformations occurred with larger vertical fingertip separations, within the same hand, and at the same hand posture. The results from a follow-up experiment conducted in the same digit position-matching task while generating forces in different directions reveal a biased relative digit position toward the direction of force production. Specifically, subjects reproduced the thumb CoP higher than the index finger CoP when vertical digit forces were directed upward and downward, respectively, and vice versa. It was also found in lifting tasks that the ability to discriminate the relative digit position prior to lifting an object and modulate digit forces to minimize object roll as a function of digit position are robust regardless of whether motor commands for positioning the digits on the object are involved. These results indicate that the erroneous sensorimotor transformations of relative digit position reported here must be compensated during dexterous manipulation by other mechanisms, e.g., visual feedback of fingertip position. Furthermore, predicted sensory consequences derived from the efference copy of voluntary motor commands to generate vertical digit forces may override haptic sensory feedback for the estimation of relative digit position. Lastly, the sensorimotor transformations from haptic feedback to digit force modulation to position appear to be facilitated by motor commands for active digit placement in manipulation.
ContributorsShibata, Daisuke (Author) / Santello, Marco (Thesis advisor) / Dounskaia, Natalia (Committee member) / Kleim, Jeffrey (Committee member) / Helms Tillery, Stephen (Committee member) / McBeath, Michael (Committee member) / Arizona State University (Publisher)
Created2014
Description
This project focuses on the experiences of families that are affected by young motherhood. United by this defining event, each of these families involved in the project come from diverse backgrounds and have faced obstacles unique to their own history. Since late 2013, they shared with me the struggles and rewards that followed a decision made early in the mother's life. Through an exhibition of photography, audio, video, and text, I aimed to communicate these stories to expand the dialogue surrounding teen pregnancy
ContributorsMollindo, Amanda Leann (Author) / Schneider, Betsy (Thesis director) / Dove-Viebahn, Aviva (Committee member) / Barrett, The Honors College (Contributor) / School of Art (Contributor)
Created2015-05
Description
This project uses the tintype process to create contemporary portraits. The tintype is a nineteenth century photographic process that creates a direct positive on a sheet of metal. The images were created using the same process from the 1800s, as well as a more contemporary method. The natural imperfections caused by both processes were used to help examine the intimacy and emotion present in the portraits.
ContributorsRichey, Jordyn Elizabeth (Author) / Danh, Binh (Thesis director) / Schneider, Betsy (Committee member) / Barrett, The Honors College (Contributor) / T. Denny Sanford School of Social and Family Dynamics (Contributor) / School of Art (Contributor)
Created2014-05
Description
Gray Area is a solo exhibition of photography in conclusion to Haylee Schiavo's studies at Arizona State University. Twenty-six images were displayed at the Step Gallery in Phoenix, and Schiavo continues to photograph for this project. The show combines her interests in two disciplines, Photography as well as Family and Human Development. She photographed a woman who self identifies as being an abuse survivor. The images display the specificity of this woman's story, but also represent the harsh realities of abuse that is highly prevalent in today's society. Her work may be found online at hayleeschiavo.com.
ContributorsSchiavo, Haylee Nicole (Author) / Schneider, Betsy (Thesis director) / Jenkins, William (Committee member) / Barrett, The Honors College (Contributor) / T. Denny Sanford School of Social and Family Dynamics (Contributor) / School of Art (Contributor)
Created2014-05
Description
Previous studies have found that the detection of near-threshold stimuli is decreased immediately before movement and throughout movement production. This has been suggested to occur through the use of the internal forward model processing an efferent copy of the motor command and creating a prediction that is used to cancel out the resulting sensory feedback. Currently, there are no published accounts of the perception of tactile signals for motor tasks and contexts related to the lips during both speech planning and production. In this study, we measured the responsiveness of the somatosensory system during speech planning using light electrical stimulation below the lower lip by comparing perception during mixed speaking and silent reading conditions. Participants were asked to judge whether a constant near-threshold electrical stimulation (subject-specific intensity, 85% detected at rest) was present during different time points relative to an initial visual cue. In the speaking condition, participants overtly produced target words shown on a computer monitor. In the reading condition, participants read the same target words silently to themselves without any movement or sound. We found that detection of the stimulus was attenuated during speaking conditions while remaining at a constant level close to the perceptual threshold throughout the silent reading condition. Perceptual modulation was most intense during speech production and showed some attenuation just prior to speech production during the planning period of speech. This demonstrates that there is a significant decrease in the responsiveness of the somatosensory system during speech production as well as milliseconds before speech is even produced which has implications for speech disorders such as stuttering and schizophrenia with pronounced deficits in the somatosensory system.
ContributorsMcguffin, Brianna Jean (Author) / Daliri, Ayoub (Thesis director) / Liss, Julie (Committee member) / Department of Psychology (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
"Phoenix as Refuge: A Photographic Exploration of Refugees Within the City" was a creative thesis project that aimed to bridge the gap between divided communities by creating awareness of refugees within the city of Phoenix. Through an IRB approved research study, multiple refugee families were interviewed and photographed. The project documented refugees and their stories and then made those interviews accessible to the greater Phoenix community. The purpose was to make the Phoenix community more aware of refugees in the hopes that this awareness would increase community activism and advocacy for this resilient yet vulnerable minority group. This paper explains the refugee resettlement process and addresses the social and economic implications of refugee resettlement and advocacy within an urban area. Many inhabitants of Phoenix are unaware the refugees that live in their city because of the geographic divide between social classes and ethnic groups. In highly urbanized communities, the geographic layout of the city leads to a more individualistic and segregated society. This notion leads to a discussion of Robert Putnam's theory of social capital, which argued that by improving and fostering social connections, one could increase social well-being and even make the economy more efficient. This paper then applies Putnam's ideas to the interaction between refugees and non-refugees, using space as a determining factor in measuring the social capital of the Phoenix community. As evident in the study of Phoenix's geographic divide between social and economic classes, Phoenix, like many urban cities, is not designed in a way that fosters social capital. Therefore, advocacy must go beyond people and into advocacy for a different kind of city and place that sets up refugees, and non-refugees alike, to succeed. In this way, rethinking the city through urban planning becomes integral to making new social networks possible, building social capital, and increasing social welfare in urban spaces.
ContributorsRutledge, Chloe Grace (Author) / Sivak, Henry (Thesis director) / Larson, Elizabeth (Committee member) / School of Art (Contributor) / School of Politics and Global Studies (Contributor) / School of International Letters and Cultures (Contributor) / Economics Program in CLAS (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
DescriptionThrough artist book, printed photographs, paintings, writing, and web design, August Tang deconstructed their identity as a nonbinary person. Both educational and expressive, the creative project was a manifestation of a coming out journey, affirmation of gender identity, and experiences relating to gender with friends, family, and strangers.
ContributorsTang, August B (Author) / Button, Melissa (Thesis director) / Sanft, Alfred (Committee member) / School of Art (Contributor) / Dean, W.P. Carey School of Business (Contributor) / The Design School (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
With Each Passing Day is a thesis exhibition presented in Northlight Archive in Tempe, AZ, accompanied by a photographic book. This work investigates me and my changing relationship with my mother as I grow into a young woman and slowly finding more of her qualities within myself as each day passes. This thesis project explores the process of growth, finding independence, and understanding acceptance and control.
ContributorsDahlstrom, Tyler (Author) / Anand, Julie (Thesis director) / Klett, Mark (Committee member) / School of Art (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
Previous research has shown that a loud acoustic stimulus can trigger an individual's prepared movement plan. This movement response is referred to as a startle-evoked movement (SEM). SEM has been observed in the stroke survivor population where results have shown that SEM enhances single joint movements that are usually performed with difficulty. While the presence of SEM in the stroke survivor population advances scientific understanding of movement capabilities following a stroke, published studies using the SEM phenomenon only examined one joint. The ability of SEM to generate multi-jointed movements is understudied and consequently limits SEM as a potential therapy tool. In order to apply SEM as a therapy tool however, the biomechanics of the arm in multi-jointed movement planning and execution must be better understood. Thus, the objective of our study was to evaluate if SEM could elicit multi-joint reaching movements that were accurate in an unrestrained, two-dimensional workspace. Data was collected from ten subjects with no previous neck, arm, or brain injury. Each subject performed a reaching task to five Targets that were equally spaced in a semi-circle to create a two-dimensional workspace. The subject reached to each Target following a sequence of two non-startling acoustic stimuli cues: "Get Ready" and "Go". A loud acoustic stimuli was randomly substituted for the "Go" cue. We hypothesized that SEM is accessible and accurate for unrestricted multi-jointed reaching tasks in a functional workspace and is therefore independent of movement direction. Our results found that SEM is possible in all five Target directions. The probability of evoking SEM and the movement kinematics (i.e. total movement time, linear deviation, average velocity) to each Target are not statistically different. Thus, we conclude that SEM is possible in a functional workspace and is not dependent on where arm stability is maximized. Moreover, coordinated preparation and storage of a multi-jointed movement is indeed possible.
ContributorsOssanna, Meilin Ryan (Author) / Honeycutt, Claire (Thesis director) / Schaefer, Sydney (Committee member) / Harrington Bioengineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
Description
Whitney Nicoson’s Honors thesis exhibition, Tripoli Shores, is a collection of photographs that stems from an initial interest in portraiture—a desire to observe and render the change of identity shown by the artist and her mother during a particularly difficult period in their lives. While experiencing paralleling hardships, the two spent time together living at her grandfather’s cottages along the St Lawrence River in Upstate NY. The traditional notion of portraiture gradually grew beyond the representation of self to the documentation of the space. This space was once the epitome of structure, stability, and strength. Over the years, neglect and disrepair caused an inevitable breakdown in the structure. Nicoson seeks to create a permanent documentation of a home that is changing. With an interest in how the photographs of space relates to the change seen in the artist and her mother, the exhibition pursues the idea of forming identity in a place that is also forming its own.
ContributorsNicoson, Whitney Rae (Author) / Jenkins, William (Thesis director) / Anand, Julie (Committee member) / Shipley, Rosalind (Committee member) / Barrett, The Honors College (Contributor) / School of Art (Contributor)
Created2013-05