Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus.
Performance in a reaction time task can be strongly influenced by the physical properties of the stimuli used (e.g., position and intensity). The reduction in reaction time observed with higher-intensity visual stimuli has been suggested to arise from reduced processing time along the visual pathway...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2006
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| _version_ | 1826307206929186816 |
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| author | Bell, A Meredith, M Van Opstal, A Munoz, D |
| author_facet | Bell, A Meredith, M Van Opstal, A Munoz, D |
| author_sort | Bell, A |
| collection | OXFORD |
| description | Performance in a reaction time task can be strongly influenced by the physical properties of the stimuli used (e.g., position and intensity). The reduction in reaction time observed with higher-intensity visual stimuli has been suggested to arise from reduced processing time along the visual pathway. If this hypothesis is correct, activity should be registered in neurons sooner for higher-intensity stimuli. We evaluated this hypothesis by measuring the onset of neural activity in the intermediate layers of the superior colliculus while monkeys generated saccades to high or low-intensity visual stimuli. When stimulus intensity was high, the response onset latency was significantly reduced compared to low-intensity stimuli. As a result, the minimum time for visually triggered saccades was reduced, accounting for the shorter saccadic reaction times (SRTs) observed following high-intensity stimuli. Our results establish a link between changes in neural activity related to stimulus intensity and changes to SRTs, which supports the hypothesis that shorter SRTs with higher-intensity stimuli are due to reduced processing time. |
| first_indexed | 2024-03-07T06:59:27Z |
| format | Journal article |
| id | oxford-uuid:ff3b1970-6ba3-425f-9401-b2ce8b3709e7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:59:27Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:ff3b1970-6ba3-425f-9401-b2ce8b3709e72022-03-27T13:43:14ZStimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ff3b1970-6ba3-425f-9401-b2ce8b3709e7EnglishSymplectic Elements at Oxford2006Bell, AMeredith, MVan Opstal, AMunoz, DPerformance in a reaction time task can be strongly influenced by the physical properties of the stimuli used (e.g., position and intensity). The reduction in reaction time observed with higher-intensity visual stimuli has been suggested to arise from reduced processing time along the visual pathway. If this hypothesis is correct, activity should be registered in neurons sooner for higher-intensity stimuli. We evaluated this hypothesis by measuring the onset of neural activity in the intermediate layers of the superior colliculus while monkeys generated saccades to high or low-intensity visual stimuli. When stimulus intensity was high, the response onset latency was significantly reduced compared to low-intensity stimuli. As a result, the minimum time for visually triggered saccades was reduced, accounting for the shorter saccadic reaction times (SRTs) observed following high-intensity stimuli. Our results establish a link between changes in neural activity related to stimulus intensity and changes to SRTs, which supports the hypothesis that shorter SRTs with higher-intensity stimuli are due to reduced processing time. |
| spellingShingle | Bell, A Meredith, M Van Opstal, A Munoz, D Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title | Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title_full | Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title_fullStr | Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title_full_unstemmed | Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title_short | Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus. |
| title_sort | stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus |
| work_keys_str_mv | AT bella stimulusintensitymodifiessaccadicreactiontimeandvisualresponselatencyinthesuperiorcolliculus AT meredithm stimulusintensitymodifiessaccadicreactiontimeandvisualresponselatencyinthesuperiorcolliculus AT vanopstala stimulusintensitymodifiessaccadicreactiontimeandvisualresponselatencyinthesuperiorcolliculus AT munozd stimulusintensitymodifiessaccadicreactiontimeandvisualresponselatencyinthesuperiorcolliculus |