TY  - JOUR
A1  - Jitsev, Evgueni
A1  - Malsburg, Christoph von der
T1  - Activity-dependent bidirectional plasticity and homeostasis regulation governing structure formation in a model of layered visual memory
T2  - BMC neuroscience 2009, 10(Suppl 1):P207
N2  - Poster presentation: Our work deals with the self-organization [1] of a memory structure that includes multiple hierarchical levels with massive recurrent communication within and between them. Such structure has to provide a representational basis for the relevant objects to be stored and recalled in a rapid and efficient way. Assuming that the object patterns consist of many spatially distributed local features, a problem of parts-based learning is posed. We speculate on the neural mechanisms governing the process of the structure formation and demonstrate their functionality on the task of human face recognition. The model we propose is based on two consecutive layers of distributed cortical modules, which in turn contain subunits receiving common afferents and bounded by common lateral inhibition (Figure 1). In the initial state, the connectivity between and within the layers is homogeneous, all types of synapses – bottom-up, lateral and top-down – being plastic. During the iterative learning, the lower layer of the system is exposed to the Gabor filter banks extracted from local points on the face images. Facing an unsupervised learning problem, the system is able to develop synaptic structure capturing local features and their relations on the lower level, as well as the global identity of the person at the higher level of processing, improving gradually its recognition performance with learning time. ...
Y1  - 2009
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7073
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-70841
N1  - © 2009 Jitsev and Malsburg; licensee BioMed Central Ltd.
VL  - 10(Suppl 1)
IS  - P207
ER  -