Two subjects at same time (prisoner's dilemma)

[Elilab]

We're trying to get e-prime to control the experiment for two subjects at the same time with a prisoner's dilemma task. Can it communicate between two computers? Should we simply have 2 screens for one computer? Can e-prime collect responses from 2 keyboards at the same time and present feedback according to both inputs?

Has anyone done something similar to this in the past?

Thanks

[Paul Groot]

Elise,

Two displays: yes, that's possible (eprime 2 pro)

Two keyboards: no (although combining different types of input devices is possible)

Creating a parallel task in a single script will not be trivial, if not impossible in most cases.

So, a single computer set-up would not be my favourite choice.

Two separate computers will be more flexible. Communication between the systems can be done in several ways. A direct serial (RS232, using nulmodem cable) or network (TCP) connection is possible, but may be difficult to do if you're not already experienced with E-Basic scripting. Handling the (asynchronous) data stream will be the most difficult part. (Depending on the complexity of the exchanged information.)

Another option is to create files on a network share that can be accessed from both computers. Although this seems easier to do, this not a very elegant and reliable method.

In very specific cases a mixture of both methods might also work. For example: a simple TCP data stream for sending events or triggers, and a file share for exchanging more complex event related info using files.

Best

Paul

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[Elilab]

Thanks Paul, much more complicated than I expected!