1. Settings

Configuring NAVIS Tool is an important step before loading your first file. You can modify the settings in the settings window, which can be opened if you click on the button with the gear symbol on the left sidebar menu or clicking in File>Settings on the top menu. The following window will open up:

As can be seen, there are four different tabs in the settings window, which will be explained one by one next. The buttons located on the bottom of the window allows the user to load a settings file, save the current configuration to a file, save the current configuration as default and restart the configuration to default values, in addition to display some information about the window.

###1.1. Main

Main is the first of them and it contains settings about the cochlea specification and about the cochleogram that will be displayed in the main window.

• If Show Cochleogram is checked, the cochleogram for the loaded file will be generated and displayed on load.
• Each event is represented as a dot in the cochleogram. Dot size lets the user choose the size of it.
• Aedat files can contain a huge quantity of firing information. Displaying every event in the cochleogram could slow down the application and the user experience. Events per dot lets the user set how many events will be represented with one dot on the cochleogram. Higher values will reduce load times.
• Channels determines the number of channels of the cochlea that you are working with.
• jAER captures events information with 32 bit for the address and 32 bit for the timestamp. If you are capturing this firing information with a different tool, timestamp may have 16 bits instead of 32. You can select the number of timestamp bits for your file in Address Length.
• Audio lets the user choose between a stereo or a mono cochlea.
• Cochleogram color sets the color for the cochleogram chart, dividing the left cochlea and the right cochlea information in two different colors that can be selected using the comboboxes. If you are working with a mono cochlea, you should only modify the left color.
• Screen size lets the user choose the height and width of the main window when not maximized based on some standardized resolutions. If you would like to set the window size to a different value that is not allowed in the drop down menu, please contact us and we will include it.

###1.2. Tools

Tools allows to configure some parameters that are used by a set of functionalities in NAVIS Tool.

• Image size lets you choose between four different sizes, which will be used to generate both Sonogram and Disparity between both cochleae tools.
• As we are working with files with a huge amount of data, the functionalities implemented cannot iterate through the entire event list looking for the events that fired in a specific timestamp. Integration period is the smallest time period that this software works with.
• Noise threshold and Noise tolerance are used for the Automatic Aedat Splitter tool. Head to that section of the wiki to know more about them. These parameters are not essential to set right now, they can be modified later after loading the file.

###1.3. PDF

NAVIS Tool has a function that generates a report or summary of the loaded file in a PDF. This window allows to check or uncheck which functionalities will appear on that PDF.

• Date when the PDF was generated.
• Cochleogram.
• Histogram.
• Sonogram.
• Average activity.
• Disparity between the left and the right cochleae (only if working with an stereo cochlea).

###1.4. Toolbar

As we told in the Getting Started section of this wiki, NAVIS Tool has two menus: the left sidebar menu and the top menu. This window allows the user to select what buttons will appear on the left sidebar menu. If none is checked, the menu will not appear.

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Now, after the NAVIS Tool configuration, you are ready to load your first file. Click on the folder symbol button on the left toolbar or in File>Load Aedat on the top menu. You can also load a CSV file with File>Load CSV; this file should have a different line for each event fired. Each line should have the timestamp and the address values separated with a semicolon.

After loading a file, the rest of the functionalities will be accessible.