Does anyone know if the number of synapses per neuron (8000) for mouse cortical cells also apply to humans? This is the first time I have seen an estimate of this number. I believe the researchers based their mouse simulation on anatomical studies.
--- "J. Storrs Hall, PhD." <[EMAIL PROTECTED]> wrote: > In case anyone is interested, some folks at IBM Almaden have run a > one-hemisphere mouse-brain simulation at the neuron level on a Blue Gene (in > > 0.1 real time): > > http://news.bbc.co.uk/2/hi/technology/6600965.stm > http://ieet.org/index.php/IEET/more/cascio20070425/ > http://www.modha.org/papers/rj10404.pdf which reads in gist: > > Neurobiologically realistic, large-scale cortical and sub-cortical > simulations > are bound to play a key role in computational neuroscience and its > applications to cognitive computing. One hemisphere of the mouse cortex has > roughly 8,000,000 neurons and 8,000 synapses per neuron. Modeling at this > scale imposes tremendous constraints on computation, communication, and > memory capacity of any computing platform. > We have designed and implemented a massively parallel cortical simulator > with > (a) phenomenological spiking neuron models; (b) spike-timing dependent > plasticity; and (c) axonal delays. > We deployed the simulator on a 4096-processor BlueGene/L supercomputer with > > 256 MB per CPU. We were able to represent 8,000,000 neurons (80% excitatory) > > and 6,300 synapses per neuron in the 1 TB main memory of the system. Using a > > synthetic pattern of neuronal interconnections, at a 1 ms resolution and an > average firing rate of 1 Hz, we were able to run 1s of model time in 10s of > real time! > > Josh > > ----- > This list is sponsored by AGIRI: http://www.agiri.org/email > To unsubscribe or change your options, please go to: > http://v2.listbox.com/member/?&; > -- Matt Mahoney, [EMAIL PROTECTED] ----- This list is sponsored by AGIRI: http://www.agiri.org/email To unsubscribe or change your options, please go to: http://v2.listbox.com/member/?member_id=231415&user_secret=fabd7936
