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

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Example 2

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Bugs

??

See Also

["func2sph-sess"]

Links

FsFast

Methods Description

??

References

["References/Lastname###"]

Reporting Bugs

Report bugs to <analysis-bugs@nmr.mgh.harvard.edu>

Author/s

DougGreve