Project
Peri-saccadic space perception
When we look at a scene we feel we perceive the visual world in all its detail and richness. What leads us to the experience of visual space and how do we integrate perception across eye movements? Even prior to saccade onset, studies using briefly flashed stimuli, revealed changes in perception such as a compression of the visual space. However, neither the neural mechanisms responsible for 'compression', nor its role in perception have been revealed. We have developed a neurocomputational model to further guide research in this area.
The model (see Hamker et al., PLOS Comp. Biol, in press) consists of two layers. Layer 1 encodes the presented stimulus position as an active population in a cortical coordinate system considering RF size and magnification. This population gets distorted by a oculomotor or attentive feedback signal. The pooled distorted population is represented in Layer 2 and used to determine the perceived position.
Funding
Visuo-spatial cognition
Federal Ministry of Education and Research (BMBF) grant within the program “Research network for cognitive abilities and their disorders in humans”
Relevant Publications
Hamker, F. H., Zirnsak, M., and Lappe, M. (2008).
About the influence of post-saccadic mechanisms for visual stability on peri-saccadic compression of object location.
J. Vision. 8(14):1, 1-13.
PDF-document
Influence of adaptation state and stimulus luminance on peri-saccadic localization.
J. Vision 8(1):15, 1-11.
PDF-document
Hamker, F.H., Zirnsak, M., Calow, D., Lappe, M. (2008)
The peri-saccadic perception of objects and space.
PLOS Computational Biology 4(2):e21
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