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Deconvolution and Collinearity
¥ Regular stimulus timing can lead to collinearity!
time
b0
b1
b2
b3
b4
b5
b0
b1
b2
b3
b4
b5
b0
b1
b2
b3
  b0
+b4
  b1
+b5
  b2
  b3
  b0
+b4
  b1
+b5
  b2
  b3
  b0
+b4
  b1
+b5
  b2
  b3
Equations
at each time
point:
Cannot tell
b0 from b4,
or b1 from b5
b0
b1
b2
b3
b4
b5
HRF from
stim #1
stim #1
Tail of HRF
from #1 overlaps
head of HRF
from #2, etc