Itch Hypotheses: From Pattern to Specificity and to Population Coding

Itch ◽  
2014 ◽  
pp. 23-30 ◽  
Keyword(s):  
Population Coding

scholarly journals A test of spatial temporal decoding mechanisms in the superior colliculus

2012 ◽  
Vol 107 (9) ◽  
pp. 2442-2452 ◽  
Author(s):  
Husam A. Katnani ◽  
A. J. Van Opstal ◽  
Neeraj J. Gandhi
Keyword(s):  
Nervous System ◽  
Motor Control ◽  
Eye Movements ◽  
Superior Colliculus ◽  
Motor Behavior ◽  
Saccadic Eye Movements ◽  
Population Coding ◽  
Population Activity ◽  
Low Levels

Population coding is a ubiquitous principle in the nervous system for the proper control of motor behavior. A significant amount of research is dedicated to studying population activity in the superior colliculus (SC) to investigate the motor control of saccadic eye movements. Vector summation with saturation (VSS) has been proposed as a mechanism for how population activity in the SC can be decoded to generate saccades. Interestingly, the model produces different predictions when decoding two simultaneous populations at high vs. low levels of activity. We tested these predictions by generating two simultaneous populations in the SC with high or low levels of dual microstimulation. We also combined varying levels of stimulation with visually induced activity. We found that our results did not perfectly conform to the predictions of the VSS scheme and conclude that the simplest implementation of the model is incomplete. We propose that additional parameters to the model might account for the results of this investigation.

Mental maze solving: directional fMRI tuning and population coding in the superior parietal lobule

2005 ◽  
Vol 165 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Pavlos Gourtzelidis ◽  
Charidimos Tzagarakis ◽  
Scott M. Lewis ◽  
David A. Crowe ◽  
Edward Auerbach ◽  
...  
Keyword(s):  
Population Coding ◽  
Superior Parietal Lobule ◽  
Parietal Lobule

scholarly journals Spatial Sensitivity in Field PAF of Cat Auditory Cortex

2003 ◽  
Vol 89 (6) ◽  
pp. 2889-2903 ◽  
Author(s):  
G. Christopher Stecker ◽  
Brian J. Mickey ◽  
Ewan A. Macpherson ◽  
John C. Middlebrooks
Keyword(s):  
Auditory Cortex ◽  
Primary Auditory Cortex ◽  
Median Plane ◽  
Stimulus Location ◽  
Population Coding ◽  
Broadband Noise ◽  
Spatial Sensitivity ◽  
Neural Ensembles ◽  
Artificial Neural Network Ann ◽  
Spike Patterns

We compared the spatial tuning properties of neurons in two fields [primary auditory cortex (A1) and posterior auditory field (PAF)] of cat auditory cortex. Broadband noise bursts of 80-ms duration were presented from loudspeakers throughout 360° in the horizontal plane (azimuth) or 260° in the vertical median plane (elevation). Sound levels varied from 20 to 40 dB above units' thresholds. We recorded neural spike activity simultaneously from 16 sites in field PAF and/or A1 of α-chloralose-anesthetized cats. We assessed spatial sensitivity by examining the dependence of spike count and response latency on stimulus location. In addition, we used an artificial neural network (ANN) to assess the information about stimulus location carried by spike patterns of single units and of ensembles of 2–32 units. The results indicate increased spatial sensitivity, more uniform distributions of preferred locations, and greater tolerance to changes in stimulus intensity among PAF units relative to A1 units. Compared to A1 units, PAF units responded at significantly longer latencies, and latencies varied more strongly with stimulus location. ANN analysis revealed significantly greater information transmission by spike patterns of PAF than A1 units, primarily reflecting the information transmitted by latency variation in PAF. Finally, information rates grew more rapidly with the number of units included in neural ensembles for PAF than A1. The latter finding suggests more accurate population coding of space in PAF, made possible by a more diverse population of neural response types.

scholarly journals Population Coding of Interaural Time Differences in Gerbils and Barn Owls

2010 ◽  
Vol 30 (35) ◽  
pp. 11696-11702 ◽  
Author(s):  
N. A. Lesica ◽  
A. Lingner ◽  
B. Grothe
Keyword(s):  
Population Coding ◽  
Interaural Time Differences ◽  
Barn Owls

scholarly journals The Effect of Correlated Neuronal Firing and Neuronal Heterogeneity on Population Coding Accuracy in Guinea Pig Inferior Colliculus

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e81660 ◽  
Author(s):  
Oran Zohar ◽  
Trevor M. Shackleton ◽  
Alan R. Palmer ◽  
Maoz Shamir
Keyword(s):  
Guinea Pig ◽  
Inferior Colliculus ◽  
Population Coding ◽  
Neuronal Firing

scholarly journals Optimal population coding by noisy spiking neurons

2010 ◽  
Vol 107 (32) ◽  
pp. 14419-14424 ◽  
Author(s):  
G. Tkacik ◽  
J. S. Prentice ◽  
V. Balasubramanian ◽  
E. Schneidman
Keyword(s):  
Population Coding ◽  
Spiking Neurons ◽  
Optimal Population
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