The Journal of Neuroscience, May 10, 2006, ():
Sustained Activity in Topographic Areas of Human Posterior Parietal Cortex during Memory-Guided Saccades
J. Neurosci. Schluppeck et al.
26: 5098
Supplemental data
Files in this Data Supplement:
- supplemental material
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Supplementary Figure 1 Measurements of eye-position. (A) Fixation stability during delay period for subject S4 (collected inside the scanner). Line, root mean squared (RMS) error of horizontal eye position (1s bins, pooled across all 64 trials, delays 8s-15s). Periods corresponding to blinks were excluded from analysis. The observed RMS error is caused by random jitter of eye position near fixation. To exclude the possibility that the subject made a series of saccades out to the target location and back to fixation, we inspected the eye movement data and found no evidence of such extraneous eye movements. (B) Accuracy of memory-guided saccades. Distance of saccade endpoint from target location as a function of delay period duration for N=12 subjects (data from Srimal et. al, 2005). Line, median. Dark shaded area, interquartile range. Light shaded region, minimum and maximum values.
- supplemental material
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Supplementary Figure 2 Effects of reducing the number of parameters in the model. (A) Same data as in Figure 3 (IPS2, right hemisphere, S1). Open symbols and errorbars, mean fMRI response ± 1 SEM across 12-16 scans. Top left panel, fMRI response for control condition (trials aborted after 1.5s, no eye movements). Other panels, fMRI responses for each delay-period duration. Shaded region, ± 1 SD of model fits (see Methods). (B) Model fit assuming no delay period activity (parameter d set to 0). (C) Model fit assuming no response to cue (parameter v set to 0). (D) Model fit assuming no activity during the saccade interval (parameter s set to 0). Resulting fit parameters and variance accounted for by the model (r2) are indicated for each panel. Setting any of the parameters to 0, a priori, caused a significant reduction in r2 values (p<0.0005, F-test for difference in the variance of residuals; dof1 161, dof2 160).
