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61
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Deconvolution and Collinearity
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Regular stimulus timing can lead to collinearity!
time
b
0
b
1
b
2
b
3
b
4
b
5
b
0
b
1
b
2
b
3
b
4
b
5
b
0
b
1
b
2
b
3
b
0
+
b
4
b
1
+
b
5
b
2
b
3
b
0
+
b
4
b
1
+
b
5
b
2
b
3
b
0
+
b
4
b
1
+
b
5
b
2
b
3
Equations
at each time
point:
Cannot tell
b
0
from
b
4
,
or
b
1
from
b
5
b
0
b
1
b
2
b
3
b
4
b
5
HRF from
stim #1
stim #1
Tail of HRF
from #1 overlaps
head of HRF
from #2, etc
