Neuroscience 2005 Abstract
| Presentation Number: | 582.13 |
|---|---|
| Abstract Title: | Stimulus and attention-driven retinotopic maps in multiple parietal, temporal, and frontal areas in the human brain. |
| Authors: |
Saygin, A. P.*1
; Sereno, M. I.1
1UC San Diego, La Jolla, CA |
| Primary Theme and Topics |
Sensory and Motor Systems - Vision -- Visual cortex: Functional organization and circuitry |
| Secondary Theme and Topics | Sensory and Motor Systems<br />- Vision<br />-- Processing of visual motion |
| Session: |
582. Visual Cortex: Topography II Slide |
| Presentation Time: | Tuesday, November 15, 2005 11:00 AM-11:15 AM |
| Location: | Washington Convention Center - Room 144A |
| Keywords: | motion, fMRI, biological motion, attention |
Using video stimuli and fMRI, we found retinotopic responses in parietal, temporal, and frontal cortex in humans (Sereno et al, SFN 2004). Here, we study the effect of stimulus content vs. attention on those maps. We used structured motion (e.g., point-light biological motion) in a polar angle mapping paradigm. In contrast to standard mapping, we also filled the background with either scrambled versions of the structured motion (a subtle stimulus contrast), or with additional copies of it (no stimulus contrast). Subjects either attended to the rotating wedge (task performed on wedge contents) or centrally (unrelated attentionally demanding foveal task). Each subject was scanned in 4-6 runs of 3 conditions: Attention+Stimulus, Stimulus, Attention. Data were analysed using Freesurfer and averaged across subjects using spherical surface morphing. Significant retinotopic responses were found in a number of areas: For the Attention+Stimulus condition, we saw maps in primary visual, lateral and ventral temporal, parietal, and frontal cortex. In lateral temporal cortex the response covered motion processing areas around MT extending into the STS. There was a continuous band of activation dorsally including V3a, V7, LIP, another area anterior to LIP (consistent with IPS2 reported in Silver et al/Schluppeck et al 2005), and extending anteriorly to the postcentral sulcus. There was clear retinotopy in the frontal eye fields and in smaller regions in anterior frontal areas. When subjects did not attend the same stimuli, several maps were still activated but reduced in both extent and strength. Effects of attention were seen in most maps but were strongest in parietal and frontal cortex. Finally, in the Attention-only condition, where the background and wedge contained identical stimuli, and only attention rotated, the same maps as in the Attention+Stimulus condition were revealed - with the exception of primary visual cortex where maps were primarily stimulus-driven. Thus retinotopic responses in multiple areas are affected both by the complexity of stimuli and by attention.
Supported by NSF.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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