The focus of this project is to understand the computational role of eye movements, hand movements, and short-term memory in natural tasks. The eye and hand tracking equipment, in conjunction with virtual reality displays, is used to delineate the trade-offs between eye movements, head movements, and memory use. The limited nature of human working memory has been taken as a kind of explanatory primitive in understanding cognitive processes. However, there has been surprisingly little effort directed at understanding why it is limited, and how these limitations play themselves out in normal behavior. This research has suggested why working memory is limited. The `active vision' approach has led to a computational model of working memory. In this model there is a real advantage to be gained by such a system in terms of simplifying the underlying cortical decision-making processes and minimizing the need for central executive control. To this end the central focus of this project is to implement a complete, constructive model of behavioral tasks on robotic hardware. A better understanding of how the system works as a whole should provide better guidance in how to approach the underlying neural organization.
| Rothkopf, Constantin A; Ballard, Dana H (2013) Modular inverse reinforcement learning for visuomotor behavior. Biol Cybern 107:477-90 |
| Fernandez, Roberto; Duffy, Charles J (2012) Early Alzheimer's disease blocks responses to accelerating self-movement. Neurobiol Aging 33:2551-60 |
| Velarde, Carla; Perelstein, Elizabeth; Ressmann, Wendy et al. (2012) Independent deficits of visual word and motion processing in aging and early Alzheimer's disease. J Alzheimers Dis 31:613-21 |
| Rothkopf, Constantin A; Ballard, Dana H (2010) Credit assignment in multiple goal embodied visuomotor behavior. Front Psychol 1:173 |
| Huxlin, Krystel R; Martin, Tim; Kelly, Kristin et al. (2009) Perceptual relearning of complex visual motion after V1 damage in humans. J Neurosci 29:3981-91 |
| Rothkopf, Constantin A; Ballard, Dana H (2009) Image statistics at the point of gaze during human navigation. Vis Neurosci 26:81-92 |
| Jovancevic-Misic, Jelena; Hayhoe, Mary (2009) Adaptive gaze control in natural environments. J Neurosci 29:6234-8 |
| Kavcic, Voyko; Ni, Hongyan; Zhu, Tong et al. (2008) White matter integrity linked to functional impairments in aging and early Alzheimer's disease. Alzheimers Dement 4:381-9 |
| Droll, Jason A; Hayhoe, Mary M; Triesch, Jochen et al. (2005) Task demands control acquisition and storage of visual information. J Exp Psychol Hum Percept Perform 31:1416-38 |
| Bayliss, Jessica D; Inverso, Samuel A; Tentler, Aleksey (2004) Changing the P300 brain computer interface. Cyberpsychol Behav 7:694-704 |
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