It is therefore hard to segregate top-down effects such as attention and changes in the information carried by sensory inputs, from bottom-up effects stemming from changes in the sensory inputs.
In order to deal with a large amount of information carried by visual inputs entering the brain at any given point in time, the brain swiftly uses the same inputs to enhance processing in one part of visual field at the expense of the others.
The mismatch arises because the presentation of the prime sets up a prediction for the response to subsequent inputs, and this prediction is carried by the backward connections from higher to lower levels in the hierarchy (see Fig. 1: B2, B3, B3).
The system under consideration is modelled by a set of second order differential equations and the assignment is carried by multi-input state feedback control.
First, it was found that when a large proportion of the excitatory synaptic input to dendritic spines is carried by NMDA channels, the pyramidal cell responds preferentially to spatially clustered, rather than random, distributions of activated synapses.
Instead, it redistributes in space the rates of the current model according to the additional knowledge carried by the input model.
Self-organization is carried by several conceptual inputs: first-order/second-order cybernetics, observed/observing systems (Foerster 1984a), autonomy, and "autopoiesis".
These crossmodal attenuations changed direction in a context-dependent manner, consistent with the changes in novelty, task relevance, and information carried by each sensory input.
Subsequent revisions were carried by JRPV and MBR with input from all authors.
These findings confirm a synergistic interaction in a macaque monkey model of episodic memory between connections carried by the fornix and cholinergic input to the inferotemporal cortex.
