Theories of spatial memory have stressed egocentric references frames as a central repository. In contrast, our work using filter responses such as those found in cortical cells, suggests a different way of storing spatial targets. Targets are stored by their features and the location of these features in the image can be quickly recovered regardless of changes in gaze as long as they remain visible. This concept has so far only been tested on static images that are processed off-line. Our plan is to definitively test this scheme by implementing it on our robot simulator. This would test the feasibility of the mechanism working on time-varying imagery that is subject to blur and variations in scale. The initial emphasis of our gaze control research will be to integrate several different fixation methods. Our first effort will be to integrate accommodation and vergence camera movements. Currently the vergence circuit alone requires almost all of our available video processing resources. The proposed expansion would allow concurrent processing of several different visual functions.
| Rothkopf, Constantin A; Ballard, Dana H (2013) Modular inverse reinforcement learning for visuomotor behavior. Biol Cybern 107:477-90 |
| 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 |
| Fernandez, Roberto; Duffy, Charles J (2012) Early Alzheimer's disease blocks responses to accelerating self-movement. Neurobiol Aging 33:2551-60 |
| 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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