Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

PHYSICAL.INI file eyelink/ Opensesame plug-in

Hi All,

I am writing after looking for this information extensively but not being used to find a definite answer. I have run an experiment on Opensesame, while using a screen with resolution (1920,1080), dimensions 30x52.5, and distance from the observer of about 40cm. I used an Eyelink Tower 1000 plus.

So far, I had thought that the output fixations and saccades from the .edf file were computed based on my parameters, the ones that I set up in Pygaze (in the script). The results looked reasonable when plotted, so I never questioned them.

However, a colleague pointed out to me that one should actually change the PHYSICAL.INI file in the host computer to be able to rely on saccade and fixation outputs, since they are computed considering the parameters specified in that file. Now, I opened this PHYSICAL.INI file and it turns out that all the parameters were very different from the ones I used (resolution 1024,768), distance of 60cm, and different screen size. I found a discussion on the SR forum where they seem to support my colleague's claim (

But if I look at the .edf file, I see the following message at the beginning of the file:

MSG	2284267 GAZE_COORDS 0.00 0.00 1920.00 1080.00

which means that at least the resolution was correct maybe? but what about the other parameters? should I actually compute saccades and fixations independently and do not trust the Eyelink's output?

I tried just one second to compute saccades for the task following this paper:

and they look basically the same as the ones outputted by the Eyelink, this despite some quite dramatic changes in the parameters hypothetically used for the computation of visual angles by the Eye-tracker. What might be going on? Does it mean that actually the eye-tracker is using the correct parameters that I gave as an input in Opensesame?

Thanks for your help, would be super appreciated!


  • Hi @SINE ,

    I actually wasn't aware of this, but it seems you're correct.

    All these settings can be configured in PHYSICAL.INI or they can be sent as commands from the experiment. PyGaze automatically sends the screen_pixel_coords command to the EyeLink, which informs the EyeLink of the display resolution. However, the screen_phys_coords command is not sent, which should inform the EyeLink of the physical size of the display, nor the remote_camera_position command, which should inform the EyeLink of the relative position of the camera.

    So yes, this probably means that the online event detection is slightly off unless the physical properties of the setup are specified in PHYSICAL.INI . The effect is likely very small, because the parameters vary only in a relatively narrow range in normal setups, and so the defaults likely work well. But it's still better to configure this properly, so I'll do that for our own setups as well now 😊

    — Sebastiaan

Sign In or Register to comment.

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games