One-dimensional dynamics of attention and decision making in LIP.
Where we allocate our visual spatial attention depends upon a continual competition between internally generated goals and external distractions. Recently it was shown that single neurons in the macaque lateral intraparietal area (LIP) can predict the amount of time a distractor can shift the locus of spatial attention away from a goal. We propose that this remarkable dynamical correspondence between single neurons and attention can be explained by a network model in which generically high-dimensional firing-rate vectors rapidly decay to a single mode. We find direct experimental evidence for this model, not only in the original attentional task, but also in a very different task involving perceptual decision making. These results confirm a theoretical prediction that slowly varying activity patterns are proportional to spontaneous activity, pose constraints on models of persistent activity, and suggest a network mechanism for the emergence of robust behavioral timing from heterogeneous neuronal populations.
Ganguli
Surya
S
Sloan-Swartz Center for Theoretical Neurobiology, University of California, San Francisco, San Francisco, CA 94143, USA. surya@phy.ucsf.edu
Bisley
James W
JW
Roitman
Jamie D
JD
Shadlen
Michael N
MN
Goldberg
Michael E
ME
Miller
Kenneth D
KD
D000818:Animals; D001288:Attention / Q000502:physiology*; D003657:Decision Making / Q000502:physiology*; D006801:Humans; D008251:Macaca; D009415:Nerve Net / Q000502:physiology; D010296:Parietal Lobe / Q000502:physiology*