claffey_matlab > PsychToolbox

claffey_matlab uses Matlab on Mac OS-X (Intel) and the Psychtoolbox 3:

There is a forum for Psychtoolbox here

PsychPortAudio

The snd command seems to be inaccurate by about 20ms

See here for a solution

http://psychtoolbox.org/wikka.php?wakka=PsychPortAudio

You may need to download an update of PTB3 to get this

http://psychtoolbox.org/wikka.php?wakka=PsychtoolboxDownload

Then run: "PsychPortAudioTimingTest"

also run>InitializePsychSound

You made need to copy of this file that can be found in /Applications/Psychtoolbox/PsychSound/libportaudio.0.0.19.dylib

You need to copy that file into one of the following directories, then retry:

If you have administrator permissions, copy it to (at your option): /usr/local/lib

or /usr/lib -- you may need to create that directories first.

If you are a normal user, you can also create a subdirectory lib/ in your home folder

then copy the file there. E.g., your user name is lisa, then copy the file into

/Users/lisa/lib/

New Psychtoolbox function for Current Design button box:

The latest beta of the psychophysics toolbox now includes KbQueueCheck and related functions that allow brief trigger pulses from the Current Designs fORP trigger box to be detected. This should allow you to continue to use these functions while also taking advantage of the other latest enhancements without the need to manually replace the distribution code with manually compiled versions:

http://tech.groups.yahoo.com/group/psychtoolbox/message/7365

Troubleshooting Video Playback in Psychtoolbox:

Solution from Ian Greenhouse:
I had trouble figuring out how to play MPEG1 files in PTB, but discovered a solution which required the demuxing (demultiplexing) of video files. The best option is to start with files that are not muxed so you do not run into the same problem. Here is the thread from the PTB forum:

http://tech.groups.yahoo.com/group/psychtoolbox/message/8415

Recovering from a crash when PsychToolbox is hiding the command

Mac

If the experiment seems to freeze, use the following sequence to break out:
Control-c (this ends the ListenChar(2) function, which intercepts all keyboard input)
Apple-period (this interrupts the current matlab scripts)
Apple-zero (this moves the focus to the command window where you type commands)
type "cls"-Enter (this clears the PsychToolbox screen)

If this does not work, try repeating the sequence several times. Also, "cls" is a shortcut for "clear Screen". (This shortcut is included with claffey_matlab, but for computers without the shortcut you will need to type the whole "clear Screen" command).

PC
If the experiment seems to freeze, use the following sequence to break out:
Ctrl-Alt-Delete (this brings up the task manager, and hopefully Window's bar at the screen bottom)
Click on the Matlab application in the Window's bar at the screen bottom
Control-c (this ends the ListenChar(2) function, which intercepts all keyboard input)
Control-break (this interrupts the current matlab scripts)
Control-zero (this moves the focus to the command window where you type commands)
type "cls-Enter" (this clears the PsychToolbox screen)

If this does not work, try repeating the sequence several times. Also, "cls" is a shortcut for "clear Screen". (This shortcut is included with claffey_matlab, but for computers without the shortcut you will need to type the whole "clear Screen" command).