EEG

The values produced by the first generation Blino 'Maker boards' (Pi-Naps_v0.2 and Tee-Naps_v0.2) are outlined in this section.

Attention

The attention value represents the intensity of the current mental 'focus' or 'attention'.

The attention level increases when the subject is focused on single task or object within the range 0-100.

These values are executed in hardware on the EEG sensor mounted to Pi-Naps_v0.2. The algorithm is implemented by Neurosky and the concept for deriving these values is outlined in their white paper : "BCI: Entertainment's Brain Hacking Tool for Control and Monitoring".

Meditation

The attention value represents the intensity of the current mental 'calmness' or 'relaxation'.

The attention level increases when the subject relax their mind and decreases when 'uneasy' or 'stressed' within the range 0-100.

These values are executed in hardware on the EEG sensor mounted to Pi-Naps_v0.2. The algorithm is implemented by Neurosky and the concept for deriving these values is outlined in their white paper : "BCI: Entertainment's Brain Hacking Tool for Control and Monitoring".

EEG Power Values

The EEG Power values are hardware accelerated FFT meaning you do not pay the cost of performing the calculations involved in a fast Fourier transform, freeing up processing power for your application and getting useful information faster.

The values produced by this transform represent the relative power within the frequency range (indicated in the table below). This can be used to infer certain properties about brain activity however, this is the challenge we leave to you, as we do not yet have resources on this topic.

The values produced here do not represent any real world units - in order to analyse and use these values they must be evaluated in a relative manner, considering temporal changes and comparing quantities only to itself(ie. number output from the current transform). The values will change (potentially by orders of magnitude) depending on a number of environmental factors, the person wearing the electrodes and the connection quality.

Name Frequency Range
Delta 0.5 - 2.75Hz
Theta 3.5 - 6.75Hz
Low-Alpha 7.5 - 9.25Hz
High-Alpha 10 - 11.75Hz
Low-Beta 13 - 16.75Hz
High-Beta 18 - 29.75Hz
Low-Gamma 31 - 39.75Hz
Mid-Gamma 41 - 49.75Hz

These values are represented by Integers that represent up to 24 bits worth of values.

Remember: These values represent the amount of power within the respective frequency band. A simple exercise: Start by seeing if you can equate closing your eyes to an increase in alpha activity by recording and plotting a session

EEG value

These values consist of raw EEG represented by 16bit signed integer values. They are output 512 times per second (approx. every 2ms).

Due to the noise floor of the signal, it should be noted that only the 12 most significant bits are relevant for processing this signal. As such you will only see values that fit this range and not the full range of 16bit integers.

Signal Quality