The EHI package contains the Vocal Emotion Discrimination Tes.

We also advise mentioning the software versions you used, in particular the versions of the EHI and psychTestR packages. You can find these version numbers from R by running the following commands:

library(EHI)
library(psychTestR)
if (!require(devtools)) install.packages("devtools")
x <- devtools::session_info()
x$packages[x$packages$package %in% c("EHI", "psychTestR"), ]

1. If you don't have R installed, install it from here: https://cloud.r-project.org/

2. Open R.

3. Install the ‘devtools’ package with the following command:

install.packages('devtools')

4. Install the EHI:

devtools::install_github('klausfrieler/EHI')

You can demo the EHI at the R console, as follows:

# Load the EHI package
library(EHI)

# Run a demo test, with feedback as you progress through the test,
# and not saving your data
EHI_demo()

# Run a demo test, skipping the training phase, and only asking 5 questions, as well a changing the language
EHI_demo(num_items = 5, language = "en")

The EHI_standalone() function is designed for real data collection. In particular, the participant doesn't receive feedback during this version.

# Load the EHI package
library(EHI)

# Run the test as if for a participant, using default settings,
# saving data, and with a custom admin password
EHI_standalone(admin_password = "put-your-password-here") 

You will need to enter a participant ID for each participant. This will be stored along with their results.

Each time you test a new participant, rerun the EHI_standalone() function, and a new participation session will begin.

You can retrieve your data by starting up a participation session, entering the admin panel using your admin password, and downloading your data. For more details on the psychTestR interface, see http://psychtestr.com/.

The EHI currently supports English (en), informal German (de) and formal German (de_f). You can select one of these languages by passing a language code as an argument to EHI_standalone(), e.g., EHI_standalone(languages = "de"), or alternatively by passing it as a URL parameter to the test browser, eg. http://127.0.0.1:4412/?language=DE (note that the p_id argument must be empty).

1. Complete the installation instructions described under 'Local use'.
2. If not already installed, install Shiny Server Open Source: https://www.rstudio.com/products/shiny/download-server/
3. Navigate to the Shiny Server app directory.

cd /srv/shiny-server

4. Make a folder to contain your new Shiny app. The name of this folder will correspond to the URL.

sudo mkdir EHI

5. Make a text file in this folder called app.R specifying the R code to run the app.

• To open the text editor: sudo nano EHI/app.R
• Write the following in the text file:

library(EHI)
EHI_standalone(admin_password = "put-your-password-here")

• Save the file (CTRL-O).

6. Change the permissions of your app directory so that psychTestR can write its temporary files there.

sudo chown -R shiny EHI

where shiny is the username for the Shiny process user (this is the usual default).

7. Navigate to your new shiny app, with a URL that looks like this: `http://my-web-page.org:3838/EHI

• The EHI runs in your web browser.
• By default, image files are hosted online on our servers. The test therefore requires internet connectivity.