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

. 2012 Oct 24;279(1749):4955–4961. doi: 10.1098/rspb.2012.2132

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

This journal is © 2012 The Royal Society

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Figure 1. — (a,b) Stimulus sequences and (c,d) behavioural results. The visual stimulus consisted of a visual disk (with a radius of 1° visual angle) that flashed once or twice at 5° eccentricity below or above the fixation cross, which was placed at the middle of the screen. The flash or flashes were combined with zero, one, or two beeps (3.5 KHz at 65 dBA). (a) The critical trial type for the sound-induced flash illusion: one visual flash is accompanied by two beeps (1F2B). (b) A trial in which two flashes were accompanied by two beeps (2F2B). (c) Behavioural results by trial type. In each trial, participants (n = 29) indicated whether they saw one or two flashes. Bars represent the percentage of correct answers by trial type, averaged across participants. xFxB refers to number of flashes and beeps, respectively (from left to right: trials with one flash and one beep; one flash and two beeps; two flashes and one beep; two flashes and two beeps; one flash only; two flashes only). Error bars represent the s.e. of the mean. Note that the second bar represents the critical trial type (one flash, two beeps). The low overall proportion of correct answers for this trial type (38%) indicates that participants perceived the illusory second flash in the remaining trials of this condition (cf. table 2). (d) The distribution of FiS across the sample.