Howdy, Stranger!

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

Supported by

Unwanted variation in presentation duration and delays related to number of times in a loop.

Hi folks,

I'm building a very straight forward paradigm with a practise block and 5 experimental blocks.

See here:

Four of the experimental blocks simply present text via Sketchpads sequentially with a fixed duration determined in keyboard_response.

I use Sketchpads instead of images of text so that we can make changes quickly etc if we need to:

I'm building the experiment using Windows 10 on a Surface Book 2.

I've noticed that when there a relatively few items in a block (such as the screenshot of Alpha_Block_Sequence above) and a key is pressed the next trial begins 'immediately'. However, when there are relatively more items as shown here:

there is a perceptible delay after a keypress before the next trial begins. Is there something I can do to avoid this happening?

Additionally, in the block below:

I have set each image to 1000ms (995 instructed) and to repeat each image 5 times randomly. The presentation order works fine but I notice a large variation in presentation time accuracy. Most are presented for approximately the requested 1000ms but random iterations of pictures are presented for longer than 1000ms. Is this likely to be an issue with my system?

Hope I've provided enough information/context on this, let me know if not.

Thanks for your time,

Boo.

Comments

  • Hi Boo,

    Just wondering, how do you know that the presentation time is not accurate? Is it really that much off, or did you actually measure the presentation time? Not sure whether it helps, but instead of having 20+ sketchpads in a single loop, you can add another loop to that layer with a single sketchpad. This will at least release some of the memory necessary to store your experiment.

    Does this make sense?

    Eduard

  • edited January 2019

    Hi Eduard,

    I haven't used any objective measure of the delays I described but they are well above perceptual threshold for detection.

    I'm not sure I understand your solution to free up memory. Is it possible to have a text file with different text stimuli that can be called into a string variable that can be used in a single SketchPad?

    Thanks for your help,

    Boo.

    EDIT: I guess I could use a Python script implementing lists or Panda dataframes. I'll look into that. Thanks for pointing me in the right direction!

  • edited January 2019

    Hi Boo,

    I attach a little script that should illustrate what I meant earlier. Basically, the idea is to reduce the number of sketchpads that you have to a single one and define the content of that sketchpad dynamically across loop iterations. This works of course only if the sketchpads area conceptually all the same.

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