dorsal/arxiv
View SchemaContext-dependent selection of visuomotor maps
| Authors | Emilio Salinas |
|---|---|
| Categories | |
| ArXiv ID | q-bio/0510037 |
| URL | https://arxiv.org/abs/q-bio/0510037 |
| DOI | 10.1186/1471-2202-5-47 |
| Journal | BMC Neuroscience 5:47, 2005 |
Abstract
Behavior results from the integration of ongoing sensory signals and contextual information in various forms, such as past experience, expectations, current goals, etc. Thus, the response to a specific stimulus, say the ringing of a doorbell, varies depending on whether you are at home or in someone else's house. What is the neural basis of this flexibility? What mechanism is capable of selecting, in a context-dependent way, an adequate response to a given stimulus? One possibility is based on a nonlinear neural representation in which context information regulates the gain of stimulus-evoked responses. Here I explore the properties of this mechanism. By means of three hypothetical visuomotor tasks, I study a class of neural network models in which any one of several possible stimulus-response maps or rules can be selected according to context. The underlying mechanism based on gain modulation has three key features: (1) modulating the sensory responses is equivalent to switching on or off different subpopulations of neurons, (2) context does not need to be represented continuously, although this is advantageous for generalization, and (3) context-dependent selection is independent of the discriminability of the stimuli. In all cases, the contextual cues can quickly turn on or off a sensory-motor map, effectively changing the functional connectivity between inputs and outputs in the networks. The model predicts that sensory responses that are nonlinearly modulated by arbitrary context signals should be found in behavioral situations that involve choosing or switching between multiple sensory-motor maps.
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"abstract": "Behavior results from the integration of ongoing sensory signals and\ncontextual information in various forms, such as past experience, expectations,\ncurrent goals, etc. Thus, the response to a specific stimulus, say the ringing\nof a doorbell, varies depending on whether you are at home or in someone else\u0027s\nhouse. What is the neural basis of this flexibility? What mechanism is capable\nof selecting, in a context-dependent way, an adequate response to a given\nstimulus? One possibility is based on a nonlinear neural representation in\nwhich context information regulates the gain of stimulus-evoked responses. Here\nI explore the properties of this mechanism. By means of three hypothetical\nvisuomotor tasks, I study a class of neural network models in which any one of\nseveral possible stimulus-response maps or rules can be selected according to\ncontext. The underlying mechanism based on gain modulation has three key\nfeatures: (1) modulating the sensory responses is equivalent to switching on or\noff different subpopulations of neurons, (2) context does not need to be\nrepresented continuously, although this is advantageous for generalization, and\n(3) context-dependent selection is independent of the discriminability of the\nstimuli. In all cases, the contextual cues can quickly turn on or off a\nsensory-motor map, effectively changing the functional connectivity between\ninputs and outputs in the networks. The model predicts that sensory responses\nthat are nonlinearly modulated by arbitrary context signals should be found in\nbehavioral situations that involve choosing or switching between multiple\nsensory-motor maps.",
"arxiv_id": "q-bio/0510037",
"authors": [
"Emilio Salinas"
],
"categories": [
"q-bio.NC"
],
"doi": "10.1186/1471-2202-5-47",
"journal_ref": "BMC Neuroscience 5:47, 2005",
"title": "Context-dependent selection of visuomotor maps",
"url": "https://arxiv.org/abs/q-bio/0510037"
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