| CPC A61B 5/375 (2021.01) [A61B 5/168 (2013.01); A61B 5/378 (2021.01); A61B 5/38 (2021.01); A61B 5/6803 (2013.01); A61B 5/7225 (2013.01); A61B 5/7267 (2013.01); A61B 5/1118 (2013.01); A61B 5/165 (2013.01); A61B 5/4064 (2013.01); A61B 5/7203 (2013.01); A61M 21/02 (2013.01)] | 19 Claims | 

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               1. A neurofeedback system comprising: 
            a memory device configured to store an EEG signal generated by one or more electrodes placed on an exterior of a head of a user to measure an activity of a brain of the user; and 
                one or more processors in communication with the memory device, the one or more processors being configured to: 
              filter the EEG signal to generate a first filtered signal corresponding to a first type of brain wave; 
                  play to the user a first audio recording corresponding to the first type of brain wave; 
                  determine a first volume threshold from the first filtered signal; 
                  set a volume level at which the first audio recording is played to a first level according at least to a comparison of the first volume threshold and a first value, the first value being determined from the first filtered signal and indicative of the activity of the brain at a first time; 
                  determine a second volume threshold from the first filtered signal, the second volume threshold being different from the first volume threshold; and 
                  set the volume level at which the first audio recording is played to a second level according at least to a comparison of the second volume threshold and a second value, the second value being determined from the first filtered signal and indicative of the activity of the brain at a second time different from the first time. 
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