Computational model of MST neuron receptive field

ISBN-13: 9783659130649 / Angielski / Miękka / 2012 / 136 str.

Chen-Ping Yu; Roger Gaborski; Charles Duffy

Opis

Optic flow informs moving observers about their heading direction. Neurons in monkey medial superior temporal cortex show heading selective responses to optic flow and planar direction selective responses to local motion patches. Our goal was to test the hypothesis that the optic flow responses reflect the sum of the local motion responses. The local motion responses of each neuron were modeled as mixtures of Gaussians derived using a genetic algorithm, to predict that neurons optic flow responses. Some neurons showed good correspondence between local motion models and optic flow responses, others showed substantial differences. Modulating the relative strength of each local motion segments responses suggest that a co-activation of receptive field segments alters neuronal response properties. We tested this by simultaneously presenting local motion stimuli at two different sites, and revealed interactions between response segments have direction and location specific effects that can account for aspects of optic flow selectivity. We conclude that MSTs optic flow selectivity reflects dynamic interactions between spatially distributed local planar motion response mechanisms.

O autorze

PhD student in computer science at Stony Brook University at the time of publishing, with Masters degrees in computer science in the area of computer/biological vision. Related research areas include computational neuroscience, statistical models of pattern recognition and machine learning, image segmentation, neuroimaging, and similarity analysis.