Hi, I'm a British guy, did an MEng at Cambridge (King's College) - my startup just ceased operating and am now topping up funds with freelancer work!
I am very conversant with Matlab, and from the outline of the task, (and some wikipedia research on 'stroop'), this feels like a fairly straightforward task (hence the low bid, around 40 gbp). I'd love to help, and have plenty of time on my hands so, pending more details from you, I estimate it won't take more than a couple of days to complete.
Of course I'd need a more precise outline of what you need - inputs / outputs, user interaction etc.
I propose, if you accept my bid, that you send me a message with details of your requirements, and we follow up either by email or by skype (I'm based in Barcelona currently).
Look forward to hearing from you,
John