Thanks, Gang,
The article was very helpful. I was looking at some data where stimuli are jittered but pretty closely spaced and the subjects had a lot of variability in response latency and duration. I found that I needed to include a long time interval for the CSPLIN model in order to achieve consistency, and at that point, it seemed like the model was capturing some of the signal from subsequent stimuli. When I try SPMG3 on these data, I get an almost identical iresp for the first 10 seconds, with a slightly higher peak in the SPMG3, so I'm thinking it might be preferable in this situation.
But I wish I understood exactly how you calculate the SPMG3 iresp from the three parameters for a given point in time post-stimulus-onset. Is that too complicated to describe?
Sally