Cognitive architecture -poznámky

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PAMnet model z LIDA nesedi na moje podvedomi mereni

In the current PAMnet implementation, each node passes its full activation value to its parent node
activation passing inward from the fringe of the network (lower conceptual depth) towards the center (higher conceptual depth).
+vypočty aktivace decay site nesedi protože je počitaj podle hloubky

zaver model je priliš nepřesnej

Podvedomi meřeni ukazu že proces je mnohem složiteší podle grafu to funguje pres CTC (comunication trought coherence ) a CFC (cross frequenci coupling )

162hz ( / ) 81hz (trojuhelnik)


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Cognitive Cycle 2 přes sebe

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Gamma-band synchronization (a group or groups of neurons pulse firing together at the rate of 40-80 Hz) can emerge in a network of excitatory and inhibitory neurons. Inhibitory neurons provide shunting inhibition that stops other neurons from firing. This provides windows for synchrony at the moment inhibition wears off. Excitatory signals can then take advantage. Gamma band oscillations are sufficiently regular to allow prediction of the next excitability peak. As long as the travelling time from the sending to the receiving group is also reliable, their communication windows for input and output are open at the same times. Conduction delays between neurons are typically and order of magnitude shorter than the cycle length of the oscillation allowing sending and receiving to occur within one excitability peak. Packages of spikes can therefore arrive at other neuronal groups in precise synchronization and enhance their impact. Rhythmic inhibition therefore provides rhythmic modulation of excitatory input gain. Fries considers the mechanistic consequences of neuronal oscillations and calls this hypothesis ‘communication through coherence’.

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Coincidence detection and rhythmic gain modulation create an exclusive communication link between a target group and a strongly synchronised source group. If there is a synchronization among the neurons in groups A and among the neurons in group B but not between A and B then a down stream group C will either synchronise to A or B but not both at the same time. Strong and precise gamma band synchronisation within group A will trigger many spikes in C and entrain C to the rhythm of A. Once entrained a winner-takes-all effect occur as the result of input gain. A competitive advantage is therefore given to one group of neurons.

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note that the fast switching between synchronized and de-synchronized states observed in the data seems at odds with: the coupling strength that can be achieved through synaptic plasticity, the speed of changes in the functional topology, and mechanisms that could cause changes in transmission delays. Hence they conclude that the most likely option for the modulation of synchrony is to change the dynamical states of the coupled neuronal populations, such as the balance between excitation and inhibition. So in addition to the firing rates, precise timing of individual discharges may be used to gate transmission and synaptic plasticity, to selectively route activity across the cortical network and to define particular relations in distributed activity patterns.

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Attention in the Brain

top-down
posterior parietal cortex - intraparietal sulcus
-spatial topography , control saccades

FEF
-saccade control
-also ATT without saccade
-current locus of attention

PFC gamma band

http://ccrg.cs.memphis.edu/assets/paper ... k-Madl.pdf

LC-NE

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phase diff FV NV -42%