Howdy, Stranger!

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

Supported by

Collecting keyboard respons during target presentation + shortly after target presentation

I have designed a task for OSWeb in which letters repeatedly appear at the left and right side of the screen, and when a target letter appears among the distractor letters, participants have to press 'space'. With a distractor letter, 'None' is the correct response. Presentation times are 300ms letter presentation and 450ms interletter, with a block including 30 trials with a distractor letter and 2 with a target letter.

I made it this way that there is a loop in which:

  1. inter-letter sketchpad is presented (445ms),
  2. letter sketchpad is presented (0ms) with either the target or non-target letter at either the left or right side of the screen (dependent on the how the variables are set for that specific trial),
  3. keyboard response (295ms)
  4. logger

I would like to collect the number of correct responses. However, as the letter presentation times are quite short for people to be able to press 'space', I would like to be able to also collect responses after the 295ms have passed, so when participants for example press space during the first 100ms of the next interstimulus sketchpad. I am struggling on how to implement this, and am not sure whether this is possible. Any suggestions would be really helpful!


  • Hi Marjolein,

    Have you looked into Co-routines? They might provide the functionality that you need.

    However, given that the response collection period extends over two trials (end of trial n, and start of trial n+1), it might be a bit tricky. In theory, you could use the same approach you have used for the letter sketchpad for all sketchpads, i.e. the inter-letter sketchpad. So basically, having a sketchpad open all the time. The tricky part is then to tease apart to which stimuli each of the responses belong. I don't think there is clear solution to that, instead it probably depends on your personal thoughts on which assumptions to make.

    Regardless, every keyboard item has a variable: "response_keyboard_response" and i think also "response_time_keyboard_response". These variable you can use to paste together the total response times in your paradigm. For example, if the variable "response_letter_keyboard_response" on trial 1 has no value, but "response_interletter_keyboard_response" has one, you could add the second response time to the first to get the total response time.

    Finally, a last thing to keep in mind. If the response is split over two trials, that will probably conflict with the prepare-run strategy of Opensesame. The experiment will still run, but the measured timings will be somewhat inaccurate.

    Hope this helps somewhat.

    Good luck,


    Buy Me A Coffee

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