| Presentation | 2005/1/17 Temporal factors influence on the location of auditory-visual integrative processing in human cortex Xilong Zhi, Yasuhiko Saito, |
|---|---|
| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Two major factors that determine whether different modal cues will be perceived as arising from the same event and integrated for perceptual gain, they are proximity in time and space. Although the recent studies found that the locations of auditory-visual integrative processing in human cortex, under synchronous bimodal stimulation condition, are different from that under bimodal stimuli onset asynchrony (SOA) condition, nothing is known about whether the different temporal gaps of auditory-visual SOA (SOA is unequal zero ms) may influence on the location. To detect this influence, event-related potentials (ERPs) were recorded from 121 scalp electrodes while subjects performed a forced-choice categorization task : At each trial, the subjects had to indicate which of two objects was presented by pressing one of two buttons. The two objects, 'A' and 'B', were defined by auditory stimulus alone, visual stimulus alone, or the combination of auditory and visual stimulus. In combination condition, visual stimulus onset was earlier 15 ms (experiment 1, SOA 15 ms) and 30 ms (experiment 2, SOA 30 ms) than the auditory stimulus onset. Spatiotemporal analysis of ERPs and high-density electrical mapping revealed several auditory-visual interaction components temporally, spatially, and functionally distinct 200 ms after visual stimulus onset in both experiment 1 and experiment 2. Comparing the effects under SOA 15 ms condition with that under SOA 30 ms condition, the results showed that (1) in prefrontal cortex, the effects may be observed not only under SOA 15 ms condition but also under SOA 30 ms condition, suggest these multisensory cells do not process auditory-visual temporal information, it is consistent with previous study that prefrontal regions specialized in auditory and visual spatial processing; (2) left visual area and right parieto-occipital area were selectively activated under SOA 15 ms condition, right temporal-occipital area and right temporal were activated for SOA 30 ms, suggest that these regions are relative to 'compensation for sound delay in human perception', and support the proposition that the different regions may be set-up to optimize audiovisual integration at different ranges of distance from the observer. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Mutisensory integration / auditory-visual interaction / temporal factor / SOA / ERP |
| Paper # | NC2004-117 |
| Date of Issue |
| Conference Information | |
| Committee | NC |
|---|---|
| Conference Date | 2005/1/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Neurocomputing (NC) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Temporal factors influence on the location of auditory-visual integrative processing in human cortex |
| Sub Title (in English) | |
| Keyword(1) | Mutisensory integration |
| Keyword(2) | auditory-visual interaction |
| Keyword(3) | temporal factor |
| Keyword(4) | SOA |
| Keyword(5) | ERP |
| 1st Author's Name | Xilong Zhi |
| 1st Author's Affiliation | Sleep Research Center, Ashikaga Institute of Technolog() |
| 2nd Author's Name | Yasuhiko Saito |
| 2nd Author's Affiliation | Sleep Research Center, Ashikaga Institute of Technolog |
| Date | 2005/1/17 |
| Paper # | NC2004-117 |
| Volume (vol) | vol.104 |
| Number (no) | 585 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |