Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Aug 22;8:12597. doi: 10.1038/s41598-018-30722-0

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

The 1-2-Go and 1-2-3-Go interval reproduction task. (A,B) Task design. Each trial began with the appearance of a fixation spot (Fix on). The color of the fixation spot informed the subject of the trial type: blue for 1-2-Go, and red for 1-2-3-Go. After a random delay, a warning stimulus (large white circle) appeared. Additionally, two or three small white rectangles were presented above the fixation spot. The number of rectangles was associated with the number of upcoming flashes. After another random delay, two (S1 and S2 for 1-2-Go) or three (S1, S2 and S3 for 1-2-3-Go) white annulae were flashed for 100 ms in a sequence around the fixation spot. Consecutive flashes were separated by the duration of the sample interval (t_s). With the disappearance of each flash, one of the small rectangles also disappeared (rightmost first and leftmost last). The white rectangles were provided to help subjects keep track of events during the trial. Subjects had to press a button after the last flash to produce an interval (t_p) that matched t_s. Immediately after button press, subjects received feedback. The feedback was a small circle that was presented to the left or right of the warning stimulus depending on whether t_p was larger or smaller than t_s, respectively. The distance of the feedback circle to the center of the warning stimulus was proportional to the magnitude of the error (t_p − t_s). (C) Experimental distribution of sample intervals. (D) Feedback. Subjects received positive feedback if production times fell within the green region. The width of the positive feedback window was scaled with t_s.