Howdy, Stranger!

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

Supported by

Duration time presentation stimuli

edited January 2016 in OpenSesame

Hello !
I have prepare a Stroop modified task. I wish to reccord reaction time of participants. When the stimulus appears on the screen, participant have to choose between 4 keys on the keypad. Open Sesame reccords correct responses and reaction time.

My problem is that in the keyboard-response, the duration is "keypress". That means the stimulus disappear after the participant gives is answer. So, the presentation time of each stimuli change according the reaction time.

What I want is to have the same presentation time for each stimuli (1000ms).

Here is my code :

Sketchpad :

set duration 0
set description "Displays stimuli"
draw textline center=1 color="[Color_word]" font_bold=yes font_family=mono font_italic=no font_size=32 html=yes show_if=always text="[Word]" x=0 y=0 z_index=0

Keyboard_response :

set timeout 3000
set flush "yes"
set duration "keypress"
set description "Collects keyboard responses"
set correct_response "[Correct_response]"
set allowed_responses "q;s;l;m"

I tried to set duration in keyboard response as "1000" ms but it crashes (the task doesn't run).

Can somebody help me with this error ?

Thank you very much !

Céline

Comments

  • edited 1:23PM

    Hi Céline,

    This sounds like a situation for the coroutines plug-in, which is described here (and needs to be installed separately):

    Essentially, you want to do two things simultaneously:

    1. Collect a keyboard response with a timeout of 3000 ms; and
    2. Show a target sketchpad, followed by a blank sketchpad 1000 ms later.

    In the coroutines plug-in, this would look as follows:

    image

    Does that make sense?

    Cheers,
    Sebastiaan

  • edited January 2018

    I had a similar problem and used your solution:

    instead of a "sequence" I added a "coroutine" but now I always get an error message!

    File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item.py", line 235, in getattr
    raise AttributeError(u'%s not found' % var)
    AttributeError: canvas not found

    I really don't get the problem. What did I do wrong?

    Thanks in advance

  • @vvogel Until recently there was a bug with feedback items within a coroutines. So that's what you're running into. I would either:

    • Use sketchpad items instead of feedback items; or
    • Grab the latest (soon-to-be released) OpenSesame 3.2 prerelease from http://osdoc.cogsci.nl/3.2

    Cheers!
    Sebastiaan

  • Hi Sebastiaan,

    I have a problem related to the topic here. I also want to present visual stimuli for a certain time and at the same time capture the reaction time measured by a keypress. I already tried to use Corountines, but in the files only the duration of the keypress itself appears, I guess, because it is always around 0.5-0.7 ms. So how is it possible to capture the time between the start of the stimulus presentation and the following keypress?

    Thank you!

    Anna

  • Hi @Anna_Schellhorn ,

    The response_time always reflects the interval between the start of the keyboard_response and the moment that a key was actually pressed. If you're using a coroutines item, this means that the start time of the keyboard_response (in the coroutines ) should coincide with the start time of the sketchpad (in the coroutines ) that contains the stimulus. Does that clear things up?

    — Sebastiaan

  • Hi Sebastiaan,

    thank you for your answer. So, the response time reflects the interval between the start time of the visual stimuli and the actual keypress and so, if i pressed the key always after approximately 5 seconds the response_time should display something around 5000ms, but in the excel file the response_time_keyboard_response displays values around 0.5(ms) and I don't understand why that is. Could you comment on that again?

    Thanks again,

    Anna

  • Hi @Anna_Schellhorn ,

    Without knowing the details of how you implemented the experiment, this is impossible to say. Could you attach the experiment file here?

    — Sebastiaan

  • Hi Sebastiaan,

    of course. Attached you should find the Example experiment file.

    Anna

  • Hi Sebastiaan,

    sorry, apparently it didn't work to attach the open sesame file. Attached you can find now some screenshots, which should demonstrate the implemented experiment.


  • @Anna_Schellhorn The start and the end time of the keyboard_response are both set to 0. So this means that key presses are only polled once, at the very start of the coroutines . If you to poll continuously, then you have to set the end time to 9995 (in your case, i.e. the duration of the coroutines ). Does that clear things up?

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 http://45.77.173.118/ 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