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

. 2019 Jul 11;10:1610. doi: 10.3389/fpsyg.2019.01610

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

Copyright © 2019 Mei, Chen and Dong.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

The trial procedure of Experiment 3. In each trial, the first facial expression was presented for 1000 ms, followed by a 1000 ms noise mask 1. After a 250 ms fixation cross, the second facial expression was presented for 500 ms, followed by a 50 ms, a 1000 ms, or a 2500 ms noise mask 2. These three various durations were counterbalanced across sessions. Then the question “which facial expression was happier” appeared until participants made a response by pressing “1” or “2.” The next trial started after a 3200 ms, a 2250 ms, or a 750 ms intertrial interval, depending on the corresponding delay durations of noise mask 2.