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Hello,

I have purchased a set of four STG4008 stimulators for driving a 32-electrode stimulating array (for use in retinal stimulation).
I am interested in bipolar stimulation, in which current is sourced from one electrode and sinked in another electrode. According to the manual I can drive a pair of electrodes (say A and B) in this push-pull configuration by connecting electrode A to the + outlet and electrode B to the - outlet of the **same** stimulating channel.

However, in this configuration the source and sink electrode pairs are fixed. I wish to change the source and sink pairs at will. My question is the following. Let's assume that I connect electrode A to the + outlet of stimulating channel #1 and electrode B to the + outlet of stimulating channel #2. Also let's assume that I connect the GND outlets of both channel #1 and channel #2 to the same point (which is remote to the stimulation sites). If I delivered identical waveforms but with opposite polarities to channels #1 and #2, would I get bipolar stimulation between electrode A and B? That is would the current flow from electrode A to electrode B, without going to the remote site where the GND outlets are connected?

Is there any other way of achieving my goal, which is bipolar stimulation between any desired pair of the 32-stimulating channels?

I would appreciate any feedback you may have.

Regards,
Nicolas P. Cottaris, Ph.D.