scholarly journals Perception of bidirectional transparent-motion requires a bimodal population response

2013 ◽  
Vol 13 (9) ◽  
pp. 973-973
Author(s):  
M. Edwards ◽  
J. Greenwood ◽  
A. Morse ◽  
C. Cassanello
Keyword(s):  
Population Response ◽  
Transparent Motion

Integration and segregation of multiple motion signals by neurons in area MT of primate

2014 ◽  
Vol 111 (2) ◽  
pp. 369-378 ◽  
Author(s):  
J. Scott McDonald ◽  
Colin W. G. Clifford ◽  
Selina S. Solomon ◽  
Spencer C. Chen ◽  
Samuel G. Solomon
Keyword(s):  
Single Unit ◽  
Multielectrode Arrays ◽  
Single Unit Recording ◽  
Population Response ◽  
Unit Recording ◽  
Temporal Area ◽  
Middle Temporal ◽  
Transparent Motion ◽  
Response Profile ◽  
Plaid Motion

We used multielectrode arrays to measure the response of populations of neurons in primate middle temporal area to the transparent motion of two superimposed dot fields moving in different directions. The shape of the population response was well predicted by the sum of the responses to the constituent fields. However, the population response profile for transparent dot fields was similar to that for coherent plaid motion and hence an unreliable cue to transparency. We then used single-unit recording to characterize component and pattern cells from their response to drifting plaids. Unlike for plaids, component cells responded to the average direction of superimposed dot fields, whereas pattern cells could signal the constituent motions. This observation provides support for a strong prediction of the Simoncelli and Heeger (1998) model of motion analysis in area middle temporal, and suggests that pattern cells have a special status in the processing of superimposed dot fields.

Ontogenetic development underlies population response to mortality

Oikos ◽  
2021 ◽  
Author(s):  
Benjamin J. Toscano ◽  
Alexandra S. Figel ◽  
Volker H. W. Rudolf
Keyword(s):  
Ontogenetic Development ◽  
Population Response

scholarly journals Dynamic population codes of multiplexed stimulus features in primate area MT

2017 ◽  
Vol 118 (1) ◽  
pp. 203-218 ◽  
Author(s):  
Erin Goddard ◽  
Samuel G. Solomon ◽  
Thomas A. Carlson
Keyword(s):  
Population Level ◽  
Similarity Analysis ◽  
Population Response ◽  
Classification Analysis ◽  
Area Mt ◽  
Temporal Area ◽  
Middle Temporal ◽  
Feature Representations ◽  
Spatial Frequencies ◽  
Stimulus Features

The middle-temporal area (MT) of primate visual cortex is critical in the analysis of visual motion. Single-unit studies suggest that the response dynamics of neurons within area MT depend on stimulus features, but how these dynamics emerge at the population level, and how feature representations interact, is not clear. Here, we used multivariate classification analysis to study how stimulus features are represented in the spiking activity of populations of neurons in area MT of marmoset monkey. Using representational similarity analysis we distinguished the emerging representations of moving grating and dot field stimuli. We show that representations of stimulus orientation, spatial frequency, and speed are evident near the onset of the population response, while the representation of stimulus direction is slower to emerge and sustained throughout the stimulus-evoked response. We further found a spatiotemporal asymmetry in the emergence of direction representations. Representations for high spatial frequencies and low temporal frequencies are initially orientation dependent, while those for high temporal frequencies and low spatial frequencies are more sensitive to motion direction. Our analyses reveal a complex interplay of feature representations in area MT population response that may explain the stimulus-dependent dynamics of motion vision. NEW & NOTEWORTHY Simultaneous multielectrode recordings can measure population-level codes that previously were only inferred from single-electrode recordings. However, many multielectrode recordings are analyzed using univariate single-electrode analysis approaches, which fail to fully utilize the population-level information. Here, we overcome these limitations by applying multivariate pattern classification analysis and representational similarity analysis to large-scale recordings from middle-temporal area (MT) in marmoset monkeys. Our analyses reveal a dynamic interplay of feature representations in area MT population response.

Sensory suppression during shifts of attention between surfaces in transparent motion

2006 ◽  
Vol 1072 (1) ◽  
pp. 110-118 ◽  
Author(s):  
Valia Rodríguez ◽  
Mitchell Valdés-Sosa
Keyword(s):  
Sensory Suppression ◽  
Transparent Motion
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