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Neural associative memories (NAM) are perceptron-like single-layer networks with fast synaptic learning typically storing discrete associations between pairs of neural activity patterns. Gripon and Berrou (2011) investigated NAM employing block coding, a particular sparse coding method, and reported a significant increase in storage capacity. Here we verify and extend their results for both heteroassociative and recurrent autoassociative networks. For this we provide a new analysis of iterative retrieval in finite autoassociative and heteroassociative networks that allows estimating storage capacity for random and block patterns. Furthermore, we have implemented various retrieval algorithms for block coding and compared them in simulations to our theoretical results and previous simulation data. In good agreement of theory and experiments, we find that finite networks employing block coding can store significantly more memory patterns. However, due to the reduced information per block pattern, it is not possible to significantly increase stored information per synapse. Asymptotically, the information retrieval capacity converges to the known limits and also for block coding. We have also implemented very large recurrent networks up to neurons, showing that maximal capacity bit per synapse occurs for finite networks having a size similar to cortical macrocolumns.
This article was published in the following journal.
Name: Neural computation
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Type of declarative memory, consisting of personal memory in contrast to general knowledge.
An area in the temporal lobe that is important for memory encoding and retrieval. It is bordered caudally by the parahippocampal cortex (see HIPPOCAMPUS) and ventrally and medially by the ENTORHINAL CORTEX.
Interruption of sympathetic pathways, by local injection of an anesthetic agent, at any of four levels: peripheral nerve block, sympathetic ganglion block, extradural block, and subarachnoid block.
Systems used to prompt or aid the memory. The systems can be computerized reminders, color coding, telephone calls, or devices such as letters and postcards.
A neuropsychological test designed to assess different memory functions. It may incorporate an optional cognitive exam (Brief Cognitive Status Exam) that helps to assess memory related cognitive function.
Collaborations in biotechnology
Commercial and academic collaborations are used throughout the biotechnology and pharmaceutical sector to enhance research and product development. Collaborations can take the form of research and evaluation agreements, licensing, partnerships etc. ...