- Poster presentation
Spike to spike MT model and applications
BMC Neurosciencevolume 8, Article number: P150 (2007)
We propose a bio-inspired MT model working in a fully spiking mode: our MT layer receives spiking inputs coming from a previous spiking V1 layer. The MT layer integrates this information to produce spikes as output. Interestingly, this spike to spike model allows us to study and model some of the dynamics existing in V1 and MT, and due to the causality of our cell representations it is also possible to integrate some top-down feedback. This model differs from existing ones such as e.g.  and , that generally have analogue entry and consider motion stimuli in a continuous regime (as plaids or gratings) discarding dynamic behaviours. In this model we also propose an implementation for the inhibition done between cells in V1 and MT. The interaction between V1 cells is done both for neighbouring cells with the same velocity and for cells with the same receptive field but different velocity orientations. On the other hand, the inhibition between MT cells is done to help the model in the detection of the pattern motion direction. The architecture and details of our model are shown in Figure 1.
Interest of a spike to spike model
We are interested in validating the behaviour of our model with:
Dynamic. The activation of MT cells is not constant in time, it suddenly increases when the motion direction is changed. We study the dynamical effects as described in .
Motion recognition. We will show how the spiking output of MT can be successfully used to recognize biological motion starting from real video sequences .
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This work was partially supported by the EC IP project FP6-015879, FACETS and CONICYT Chile.