Index TableOfContents
Name
sphsmooth-sess - smoothes hemodynamic averages on the surface
Synopsis
sphsmooth-sess ??
Arguments
Positional Arguments
none
Required Flagged Arguments
??
Optional Flagged Arguments
-smoothsteps <n> |
number of smoothing steps |
-analysis <analysisname> |
session-level functional analysis name |
-insphdir <dirname> |
input spherical space directory name <sph> |
-outsphdir <dirname> |
output spherical space directory name |
-hemi <hemisphere> |
<hemisphere> = lh or rh |
-sf <sessidfile> |
... |
-df <srchdirfile> |
... |
-s <sessid> |
... |
-d <srchdir> |
... |
-umask <umask> |
set unix file permission mask |
-scriptonly |
don't run, just generate a script |
-version |
print version and exit |
Outputs
<??> |
?? |
Description
["sphsmooth-sess"] will smooth an analysis on the surface. The results of the analysis must have been resampled onto the sphere using ["func2sph-sess"]. By default, the input directory will be sph (as created by ["func2sph-sess"]). The user must supply the output directory. To access the smoothed data in subsequent calls (eg, ["isxavg-re-sess"] or ["isxavg-fe-sess"]), add -spacedir followed by the name given to the output directory.
The amount of smoothing is controlled by the number of smoothing steps (-smoothsteps). A single smoothing step is when each vertex is averaged with its neighbors. This will be performed iteratively as many times as specified. This is ROUGHLY equivalent to a gassian kernel with StdDev of SQRT(nsmooth*2/pi). The FWHM = (2.3*StdDev)/1.24. The StdDev and FWHM are in mm. I emphasize that this is a rough equivalence; the actual StdDev will probably be a little more.
How much smoothing you do depends upon your data. Ideally, it should be the same as your activation size.
See http://www.nmr.mgh.harvard.edu/~greve/surf-smooth
Examples
Example 1
??
Example 2
??
Bugs
??
See Also
["func2sph-sess"]
Links
Methods Description
??
References
["References/Lastname###"]
Reporting Bugs
Report bugs to <analysis-bugs@nmr.mgh.harvard.edu>