PEER 2.0 Release Notes

PEER 2.0 is a significant step forward. The application is now more customizable and offers in-app purchases that expand both its on-board analytical capacities and the selection of available research paradigms. We have also upgraded the Oddball and Go-No-Go games to include audio versions.

In addition, we've made numerous smaller improvements that make your research process easier, ranging from built-in documentation that can be accessed offline to support for simultaneous two-screen use. A complete list of changes follows:

New Features

  1. BrainVision Export - PEER can now export recordings for use with Brain Products Gmbh’s BrainVision Analyzer.
  2. Studies - PEER 2.0's recording menu now allows you to create studies, which are specific instances of a particular game. This change allows you to create different customized settings for each experiment, not just for each game. For example, the app is now able to keep track of multiple Passive Oddball studies, each with its own unique settings for the number of rounds, target circle colours, and so forth.
  3. Gambling Task Game (In-App Purchase) - This new research paradigm is a highly-customizable gambling task that allows the researcher to write their own UI script. Available for a one-time fee as an in-app purchase.
  4. P300/N200 Display (In-App Purchase) - PEER 2.0 can now calculate and display P300 and N200 values for Oddball recordings. Available for a one-time fee as an in-app purchase.
  5. Audio versions for Oddball and Go No-Go - The Oddball and Go No-Go games now include auditory versions, in which user ERPs are evoked with different pitches of sound.
  6. Baseline Data Recording - PEER 2.0 includes the option to record baseline EEG data before a game begins.
  7. Improved Documentation - The original version of PEER did not have any built-in documentation. Our new version includes resources that are stored locally on your device and do not require an active Internet connection. These include release notes, FAQs, and helpful hints for fitting users with the MUSE headband. Details about marker data are included in the FAQs.
  8. Second Screen Support - The application now has the capacity to display live EEG data on a second screen, enabling researchers to independently monitor their experiments while they are in progress.
  9. Lab Environment Support - When operating in a lab environment in which multiple MUSE headbands are active, PEER 2.0 now has the ability to select and interface with a specific MUSE headband.
  10. Storage Status Reporting - The "Connection and Settings" panel now reports available and used storage space.
  11. Passcode Protection for Study Settings - Once you have customized the settings for your studies, you can protect those settings from tampering by locking them with a passcode.

Changes to Existing Features

  1. Recording Autosave - Recordings are now saved without prompting the user to input a name for the file. The names of autosaved recordings can be changed afterward in the settings for the study associated with the recording.
  2. Raw EEG Signal Quality Display - The raw EEG recording window now has signal quality bars to facilitate live monitoring of EEG quality.
  3. Named Colors for Oddball - PEER now allows you to give specific names to colors displayed for control and stimulus circles.
  4. Improved Signal Quality Monitoring - The application now monitors your EEG signal quality (MUSE signal loss or artifacts) and offers to repeat the current trial block if it falls below an acceptable level.
  5. Export Progress Reporting - PEER 2.0 displays a bar graph to indicate progress when exporting recordings in preparation for sharing.
  6. Settings & Connection UI Reorganization - The settings and connection panel now shows critical information at a glance. This information includes MUSE headband connection, signal quality and battery level.
  7. Preview "Scenes" for Game Settings - The settings for games have been organized into "scenes" that provide a live preview of how your current settings will appear in the game. To reduce clutter and complexity, only settings relating to the active "scene" (e.g. fixation, stimulus) are displayed at any given time.
  8. Miscellaneous Bug Fixes - Working from feedback by PEER users, we have provided fixes for various minor issues.


  1. iOS 10 Required, iOS 12 or Later Recommended - PEER 2.0 is compatible with iOS 10 and above. However, for optimal performance, we recommend that you use iOS 12 or later, as the newer versions address various issues that might affect PEER. For example, exporting recordings to a Macintosh via AirDrop is possible with iOS 12 or later, but will fail if your device is running an earlier version.
  2. Compatible with the MUSE 2 Headband - You can use either the 2016 version of the MUSE, or you can use the newer MUSE 2. However, please note that PEER does not record information from the new sensors that were introduced for the MUSE 2. It only records information from the sensors that are present on both models.