Dear Aser,
The 3D plot (on the left) is a surface representation of the BOLD
response over time (post stimulus time) and as a function of your
parametric modulator. The 2D plot (on the right) is just a transect of
that surface at a given time point (for when the response is maximal).
See, eg, figure 31.18 in the SPM manual:
http://www.fil.ion.ucl.ac.uk/spm/doc/manual.pdf
Best regards,
Guillaume.
On 11/11/17 12:32, Aser A wrote:
> Dear Guillaume and all
>
> When I plot the parametric modulation spm plots this as 3D plot in the
> right corner. Can I ask what is the x axis ( it says poststimuls (or per
> stimulus) time but to me it seems to be fixed at around 5 seconds. So
> what is the point of the 3D Plot? Is this the time of the amplitude of
> the HRF where it peaks?
>
> Many thanks
>
> Aser
>
>
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
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