Dissociable neural mechanisms supporting visual short-term memory for objects. Unique features of action potential initiation in cortical neurons
Four experiments are reported using functional magnetic resonance imaging to test the hypothesis that visual short-term memory (VSTM) capacity is limited to a fixed number of objects or whether it is variable. The experiments conducted by dissociating the representation capacities of the parietal and occipital cortices indicates that VSTM capacity is determined both by a fixed number of objects and by object complexity.
Author: Yaoda Xu, Marvin M. Chun
Vision research, Short-term memory
Quantitative analysis of the dynamics of action potential initiation in cortical neurons in vivo, in vitro and in computational methods is presented. A model based on the cooperative activation of sodium channels that reproduces the observed dynamics of action potential initiation is proposed.
Author: Naundorf, Bjorn, Wolf, Fred, Volgushev, Maxim
Neurons, Computational biology
Perceived luminance depends on temporal context
A novel illusion in which temporal relationships affect brightness perception is reported. The temporal context indicates two parallel streams, one adapting and another non-adapting, which encodes brightness in the visual cortex.
Author: Eagleman, David M., Jacobson, John E., Sejnowski, Terrence
Subjects list: Research, Visual cortex, United States
Abstracts: Choice and context: testing a simple short-term choice rule
Abstracts: Correlation between neural spike trains increases with firing rate. Non-classical receptive field mediates switch in a sensory neuron's frequency tunning
Abstracts: Hierarchical strategy for relocating food targets in flower bats: Spatial memory versus cue-directed search. Spatial structure and parental aggression in eider broods
Abstracts: Modular decomposition in visuomotor learning. Signal-dependent noise determines motor planning. Bayesian integration in sensorimotor learning