PEBL: The Psychology Experiment Building Language

About

This is the main website for the PEBL programming language and execution environment. PEBL is:

• Free psychology software for creating experiments
• Allows you to design your own experiments or use ready-made ones
• Lets you exchange experiments freely without license or charge

PEBL is designed to be easily used on multiple computing platforms. Its current implementation uses the SDL as its implementation platform, which is also a cross-platform library that compiles natively under Win32, Linux, and Macintosh Operating Systems.

PEBL is programmed primarily in C++ (although you do not need to know C++ to use PEBL), but also uses flex and bison (GNU versions of lex and yacc) to handle parsing.

Get PEBL 0.13 for Windows Here!

The latest release of PEBL, version 0.13, is now available. Along with a lot of little fixes and updates, there are two major new functionalities that will impact users. First, the underlying list structure used by PEBL is now a vector, allowing constant-time access of arbitrary elements. This transition has some pretty nice benefits for accessing elements efficiently, with very little drawback for the typical uses of PEBL. Next, we now support playback of movies and audio-media files via the waave library, which itself uses the ffmpeg library. Smaller changes include improved functions for handling screen size, network communication, improvements to the launcher, a change in how AddObject works when the object already has een added to a window, In the battery, I've changed every test so that they save data in .csv format for easier analysis, and they should also save in a data\ subdirectory. I've added several new tests to the test battery, including Salthouse's Connections task, a few memory tasks (one patterned on Ebbinghaus, the so-called Brown-Peterson test, the Dual N-Back test, Sternberg's memory scanning task, and others. Also, there is improved support for multi-user systems. Now, PEBL will launch the first time and copy files to your Documents folder.

[2012-01-02]PEBL Version 0.12 and Test Battery 0.7

The latest public release of PEBL, version 0.12, brings with it a lot of new features and capabilities. Highlights include support for a number of hardware interface devices, a new launcher, over 250 total functions, audio input, and a number of new tests in the PEBL Test Battery, and many bug fixes and improvements. Some of the biggest and most visible changes include:

• A new cross-platform launcher that is written in PEBL itself. The old launcher will probably still work if you want it to, but it is no longer possible to update it.
• The test battery has grown to nearly 60 tests, with many new translations.
• Basic support for many hardware devices, including joysticks, parallel port input/output, and serial port input and output, which allows use of a lot of USB devices such as the DLP-IO8, Cedrus RB button boxes, Lu's RTBox, and others.
• More forgiving interaction with your computer, including fallback screen resolutions, no more overwriting data files, better audio support, and improved filesystem access.

[2010-07-23]PEBL Version 0.11 and Test Battery 0.6

I've released the newest version of PEBL, version 0.11, and a new version of the PEBL test battery, called 0.6. Version 0.11 contains a lot of under-the-hood fixes to memory management. Previously, PEBL had a number of memory leaks which could end up crashing the system if it ran for too long. Most (all?) are now gone, which should improve performance. Also, a new widget called a 'canvas' is available, which lets you create more complex widgets, do pixel-drawing and other cool stuff. Using it sometimes can (reliably) cause crashes the program on windows that I have not yet tracked down, so think of it as fairly experimental right now.

Also, I've made a lot of progress toward enabling internationalized experiments. I've also now have translations of the BCST and Bechara Gambling task into polish, chinese, and korean, and translation of TOL into Spanish (and Portuguese soon). Those of you who want translated versions of these tasks can now do translations of text strings and run by specifying a two-character country code in the launcher. This comes at a slight cost--korean and chinese fonts are now included, making the download about 50% larger than last time. Also, I've moved to a default font which handles western characters much better, so accents on most european languages should be handled seamlessly.

Also, along with a windows installer, I'm releasing a stand-alone version for windows (in case you don't want to install it), and a .deb suitable for some Ubuntu linux systems. I once again have PEBL running on OSX, and will work toward a distributable version of PEBL 0.11 on OSX in the near future.

[2010-02-09]PEBL Test Battery Version 0.5
I've uploaded a new revision of the PEBL test battery, which I'm calling version 0.5. It is a drop-in replacement for the Battery Version 0.4 that comes with the last release of PEBL, and includes:

• Updates to Card sort and gambling task to support mouse control, easy internationalization, and improved visual feel.
• Improvements to the Tower of London to make it a full-fledged test.
• Substantial improvements to the trail-making test
• Several new tests that did not make it into previous batteries, including
  • matchtosample; The match-to-sample test
  • itemorder: The "item-order" test that appears in some traditional aptitude test batteries
  • mspan: A new memory span test with visual-grid input. Available both as a staircase and a build-up method (sort of like the game Simon)
  • probmon: Probability monitoring--watch 1-3 gauges for a noisy signal
  • satest: A visual situation awareness monitoring task.
  • timetap: A simple tapping test

For help designing and writing an experiment, you can contact the PEBL Project at: pebl-list@lists.sourceforge.net. You can sign up for this email list or browse the archives here. The PEBL WIKI allows anybody to edit or add content related to PEBL, including hints, new experiments, and library functions. Finally, there are a number of community forums to ask questions on. More information about Shane Mueller, PEBL's creator and maintainer, is available here.