Two subjects at same time (prisoner's dilemma)

[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


On 15 May 2013 23:41, Elilab <elisellemoyne at gmail.com> wrote:

> 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
>
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