G. Buzsaki, Two-stage model of memory trace formation: a role for 'noisy` brain states, Neuroscience 31 (1989) 551 -- 570.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... [98] has been simulated in a modified version of this model, in which stored hippocampal representations gradually cause formation of discrete neocortical representations via feedback connections [13] This demonstrates the consolidation of information proposed in a number of previous articles [17,98,127]. In fact, cortical dynamics in the absence of cholinergic modulation are particularly well suited to this process of consolidation, which resembles retrieval in that it involves transferring information back from hippocampus to neocortex. Physiological data has already been obtained to support ....

G. Buzsaki, Two-stage model of memory trace formation: a role for 'noisy` brain states, Neuroscience 31 (1989) 551 -- 570.

....unique mechanism supporting WM operation and LTM consolidation. This unique process takes advantage of the reciprocal, topographically organized connections between cortex and hippocampus, combined with the endogenous property of pyramidal neurons, mostly in the CA3 region, to discharge by bursts (Buzsaki, 1989), and synchronise within populations connected by previously facilitated synapses. Endogenously generated bursts of activity have been documented in the CA3 region, and are manifest at CA1 level as sharp waves. In contrast with theta rhythm which have been consistently recorded mostly in rodents, ....

....potentiation particularly developed in Hs. To this propensity for rapid transient learning must be added the loop like organization of the different circuits which allows for a few repetitions or iterations of patterns of activation even though they have been externally triggered only once (Buzsaki, 1989). Thus, these loops endow Hs with the potential to maintain for some limited duration, or rather to punctually reactivate, a recently activated pattern that has been transiently learned in the synaptic connections of the recruited populations. As a consequence of these temporal properties, the ....

[Article contains additional citation context not shown here]

Buzsaki, G.(1989). Two-stage model of memory trace formation: A role for 'noisy' brain states. Neuroscience,31, 551-570.

....to obtain data that would specifically document explicit reminiscence in nonhumans. In both rodents and primates, during periods of quiet wakefulness and slow wave sleep, hippocampal electrical activity is characterized by a unique pattern called sharp waves or ripples (O Keefe Nadel, 1978; Buzsaki, 1989). Hippocampal sharp waves are brief periods of quasi synchronous, high frequency burst discharge of hippocampal neurons, lasting about 100 msec. In theory, such activity provides the optimal conditions for synaptic plasticity in downstream neurons (Douglas, 1977; McNaughton, 1983; Buzsaki, ....

....of quasi synchronous, high frequency burst discharge of hippocampal neurons, lasting about 100 msec. In theory, such activity provides the optimal conditions for synaptic plasticity in downstream neurons (Douglas, 1977; McNaughton, 1983; Buzsaki, McClelland, McNaughton O Reilly 31 1989) Buzsaki (1989) and his colleagues (Chrobak Buzsaki, 1994) have provided a strong case that sharp waves arise in hippocampal area CA3 and are propagated both to area CA1 and to the output layers of the entorhinal cortex, one of the parahippocampal regions. Thus, patterns stored in the hippocampus might ....

Buzsaki, G. (1989). Two-stage model of memory trace formation: A role for `noisy' brain states.

....to the control of neuronal activity and the sleep wake cycle [53,54] We extend this assertion by proposing that memory coding, storage and recall make use of different spiking regimes in the hippocampus. This hypothesis is compatible with the two stage model of memory advocated by Buzsaki [15]. In particular, we propose that mnemonic recall involves the convergence of cellular activity to a stored attractor state under the control structure imposed by gamma and thetaband oscillatory activity. 1.3. A biological autoassociati#e attractor network The network we have chosen to construct ....

....and allow the bursting behavior to re emerge. This mechanism is likely to play a role in the switch between the functional modes of learning and recall. 4. Discussion 4.1. Comparison with pre#ious computational studies Although our model is largely inspired by Buzsaki s two stage memory model [15] and his suggested role for interneurons [16] it also bears some resemblance to the model put forth by Lisman and colleagues [45,50] in its reliance on theta and gamma rhythms. The Lisman model is concerned primarily with storing spatial patterns of spikes as reverberating activity that repeats ....

[Article contains additional citation context not shown here]

Buzsaki G. Two-stage model of memory trace formation: a role for `noisy' brain states. Neuroscience 1989;31:551 -- 70.

No context found.

Buzsaki, G. (1989) Two-stage model of memory trace formation: a role for `noisy' brain states Neuroscience 31, 551--570

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC