A dynamic network model of temporal receptive fields in primary auditory cortex
Auditory neurons encode stimulus history, which is often modelled using a span of time-delays in a spectro-temporal receptive field (STRF). We propose an alternative model for the encoding of stimulus history, which we apply to extracellular recordings of neurons in the primary auditory cortex of an...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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Public Library of Science
2019
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| _version_ | 1797080779492163584 |
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| author | Rahman, M Willmore, B King, A Harper, N |
| author_facet | Rahman, M Willmore, B King, A Harper, N |
| author_sort | Rahman, M |
| collection | OXFORD |
| description | Auditory neurons encode stimulus history, which is often modelled using a span of time-delays in a spectro-temporal receptive field (STRF). We propose an alternative model for the encoding of stimulus history, which we apply to extracellular recordings of neurons in the primary auditory cortex of anaesthetized ferrets. For a linear-non-linear STRF model (LN model) to achieve a high level of performance in predicting single unit neural responses to natural sounds in the primary auditory cortex, we found that it is necessary to include time delays going back at least 200 ms in the past. This is an unrealistic time span for biological delay lines. We therefore asked how much of this dependence on stimulus history can instead be explained by dynamical aspects of neurons. We constructed a neural-network model whose output is the weighted sum of units whose responses are determined by a dynamic firing-rate equation. The dynamic aspect performs low-pass filtering on each unit's response, providing an exponentially decaying memory whose time constant is individual to each unit. We find that this dynamic network (DNet) model, when fitted to the neural data using STRFs of only 25 ms duration, can achieve prediction performance on a held-out dataset comparable to the best performing LN model with STRFs of 200 ms duration. These findings suggest that integration due to the membrane time constants or other exponentially-decaying memory processes may underlie linear temporal receptive fields of neurons beyond 25 ms. |
| first_indexed | 2024-03-07T01:05:04Z |
| format | Journal article |
| id | oxford-uuid:8b0d05ec-87e8-434f-af75-68bea60b78f8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:05:04Z |
| publishDate | 2019 |
| publisher | Public Library of Science |
| record_format | dspace |
| spelling | oxford-uuid:8b0d05ec-87e8-434f-af75-68bea60b78f82022-03-26T22:35:33ZA dynamic network model of temporal receptive fields in primary auditory cortexJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8b0d05ec-87e8-434f-af75-68bea60b78f8EnglishSymplectic Elements at OxfordPublic Library of Science2019Rahman, MWillmore, BKing, AHarper, NAuditory neurons encode stimulus history, which is often modelled using a span of time-delays in a spectro-temporal receptive field (STRF). We propose an alternative model for the encoding of stimulus history, which we apply to extracellular recordings of neurons in the primary auditory cortex of anaesthetized ferrets. For a linear-non-linear STRF model (LN model) to achieve a high level of performance in predicting single unit neural responses to natural sounds in the primary auditory cortex, we found that it is necessary to include time delays going back at least 200 ms in the past. This is an unrealistic time span for biological delay lines. We therefore asked how much of this dependence on stimulus history can instead be explained by dynamical aspects of neurons. We constructed a neural-network model whose output is the weighted sum of units whose responses are determined by a dynamic firing-rate equation. The dynamic aspect performs low-pass filtering on each unit's response, providing an exponentially decaying memory whose time constant is individual to each unit. We find that this dynamic network (DNet) model, when fitted to the neural data using STRFs of only 25 ms duration, can achieve prediction performance on a held-out dataset comparable to the best performing LN model with STRFs of 200 ms duration. These findings suggest that integration due to the membrane time constants or other exponentially-decaying memory processes may underlie linear temporal receptive fields of neurons beyond 25 ms. |
| spellingShingle | Rahman, M Willmore, B King, A Harper, N A dynamic network model of temporal receptive fields in primary auditory cortex |
| title | A dynamic network model of temporal receptive fields in primary auditory cortex |
| title_full | A dynamic network model of temporal receptive fields in primary auditory cortex |
| title_fullStr | A dynamic network model of temporal receptive fields in primary auditory cortex |
| title_full_unstemmed | A dynamic network model of temporal receptive fields in primary auditory cortex |
| title_short | A dynamic network model of temporal receptive fields in primary auditory cortex |
| title_sort | dynamic network model of temporal receptive fields in primary auditory cortex |
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