Computer manufacturers have taken to assigning the function keys with additional actions. Often, these additional functions are shortcuts to common actions that most users perform (adjust screen brightness, enabling airplane mode, adjusting volume, etc.). By default, pressing these function keys on these computers will perform the additional action instead of acting as a normal function key. In this mode, the function keys are commonly called 'action keys', as they perform the additional action assigned to them rather than behaving like a normal 'function key'.
Every time a key is pressed on the keyboard, this information is sent from Windows to EEGer - except when action keys are enabled. To pause or unpause a session, EEGer is waiting for Windows to tell it that 'F5' was pressed. If action keys are enabled, the computer never detects 'F5' as being pressed. Instead, it is told to perform the additional action, such as 'activate airplane mode' or 'disable the computer's trackpad'. Because of this, EEGer is never told that the user tried to press 'F5', so it does not know to pause or unpause the session. 

There are a few ways to fix this:

Using the Fn Key to Toggle Function Keys

In the bottom-left of most keyboards, near Ctrl, there will be a key labeled Fn. When held, this Fn key toggles 'action keys' off so that normal 'function keys' can be used. This allows the user to benefit from the additional actions, but when needed they can hold Fn to toggle the function keys to send commands to EEGer instead of performing their additional action. For example, instead of pressing F5 to pause or unpause a session, a user would press Fn+F5. Instead of pressing Ctrl+F7 to check impedance, a user would press Ctrl+Fn+F7

This is the simplest way to correct the issue, as it does not require additional configuration.


Enabling Function Lock

Several keyboards feature a function lock key, or shortcut, which locks the function keys into performing their original actions. The method for activating this will vary depending on the brand and model of computer. Typically, an LED will be illuminated to signify that function lock is enabled. On some computers, there is a dedicated Fn Lock button. On others, this is activated by pressing a combination of keys. Common combinations include include Shift+FnCtrl+Fn, and Esc+Fn. It is recommended to search online for the specific model of computer being used to see if it has a function lock and the series of actions needed to enable it. As an example, here is a support page with information for HP Laptops.

Permanently Changing Function Key Behavior

Instead of a function lock, some models of computers require the behavior of the function keys to be toggled through the computer's BIOS. This can be a difficult process, but several step-by-step tutorials exist online for different models of computers. As a more user-friendly solution, some computer brands have a special program on the computer that allows these changes to be made.
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