matlabpsychtoolboxkeyboard-input

Why is KbCheck in Psychtoolbox not registering keyboard input?

I'm trying to run a programme coded in Psychtoolbox-3 that should register a keypress. But when I run it, even just this section from the command window, it doesn't respond to the E, P keys (or any) and I have to stop the operation using Ctrl-C. I have tried changing it to {e, p} (which are the names I found using KbName('KeyNames')), but it doesn't work. The same code works on my supervisor's computer - I am using a Mac with OS 11.1.

KbName('UnifyKeyNames');
keyresp = KbName({'E','P'});
key = 0;
while ~key
    [key,tkey] = CheckKeyPress(keyresp);
end

The CheckKeyPress is this function (and it works - gives output 0):

function [key,tkey] = CheckKeyPress(whichkeys)

if nargin < 1 || isempty(whichkeys)
    whichkeys = 1:256;
end

key = 0;
[iskeydown,tkey,keys] = KbCheck(-1);
if any(keys(whichkeys))
    key = find(keys(whichkeys),1);
end

end

I have also tried looking at PsychHID('Devices') and my keyboard is there (and no other keyboards).

Thanks for any help!

Solution

  • Solved! It was a simple mac problem :)

    After I tried KbQueueCreate and got an error message I found the same one on another thread - the only problem is I had to allow Matlab to access keyboard input on my laptop.

    Settings - Security and Privacy - Input Monitoring