developer_tools_2.5_development_guide.txt · Last modified: 2014/07/01 10:51 by neurosky

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neurosky [Developer Tools Version History]
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neurosky [Introduction]
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 The highest level interface provides an SDK to develop applications for Windows and Mac OS X. The included sample code provides a detailed way to receive and use bio-signal data. These two higher-level interfaces supply executables and binary libraries for some of the most common computing platforms, like Windows and Mac OS X. The lowest-level Serial Stream SDK interface provides source code and low level communication stream specs that allow headset development on virtually any platform that can receive a serial data stream.
-Please review the appropriate chapter for the interface and platform you are interested in developing for. Or read on in this Development Guide to learn about all the  different interfaces.
+Please review the appropriate chapter for the interface and platform you are interested in developing for. This Development Guide provides a broad summary of the different interfaces.
 ===== About NeuroSky's ThinkGear =====
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+===== eSense(tm) Meters =====
+One of the first questions on development is: What does the data mean?
+For the different types of eSenses (i.e. Attention, Meditation), the meter value is reported on a relative scale of 1 to 100. On this scale, a value between 40 to 60 at any given moment in time is considered “neutral”, similar in notion to the “baselines” that are established in conventional EEG measurement techniques (though the method for determining a ThinkGear baseline is proprietary and may differ from conventional EEG). A value from 60 to 80 is considered “slightly elevated”, and may be interpreted as levels possibly higher than normal (levels of Attention or Meditation that may be higher than normal for a given person). Values from 80 to 100 are considered “elevated”, meaning they are strongly indicative of heightened levels of that eSense.
+Similarly, on the other end of the scale, a value between 20 to 40 indicates “reduced” levels of the eSense, while a value between 1 to 20 indicates “strongly lowered” levels of the eSense. These levels may indicate states of distraction, agitation, or abnormality, according to the opposite of each eSense.
+An eSense meter value of 0 is a special value indicating the ThinkGear is unable to calculate an eSense level with a reasonable amount of reliability. This may be (and usually is) due to excessive noise as described in the POOR_SIGNAL Quality section above.
+The reason for the somewhat wide ranges for each interpretation is that some parts of the eSense algorithm are dynamically learning, and at times employ some “slow-adaptive” algorithms to adjust to natural fluctuations and trends of each user, accounting for and compensating for the fact that EEG in the human brain is subject to normal ranges of variance and fluctuation. This is part of the reason why ThinkGear sensors are able to operate on a wide range of individuals under an extremely wide range of personal and environmental conditions while still giving good accuracy and reliability. Developers are encouraged to further interpret and adapt these guideline ranges to be fine-tuned for their application (as one example, an application could disregard values below 60 and only react to values between 60-100, interpreting them as the onset of heightened attention levels).
+===== Attention eSense =====
+The Attention value which indicates the intensity of a user's level of mental “focus” or “attention”, such as that which occurs during intense concentration and directed (but stable) mental activity. Its value ranges from 0 to 100. Distractions, wandering thoughts, lack of focus, or anxiety may lower the Attention meter levels. See eSense(tm) Meters above for details about interpreting eSense levels in general.
+===== Meditation eSense =====
+The Meditation value indicates the level of a user's mental “calmness” or “relaxation”. Its value ranges from 0 to 100. Note that Meditation is a measure of a person's mental levels, not physical levels, so simply relaxing all the muscles of the body may not immediately result in a heightened Meditation level. However, for most people in most normal circumstances, relaxing the body often helps the mind to also relax. Meditation is related to reduced activity by the active mental processes in the brain, and it has long been an observed effect that closing one's eyes turns off the mental activities which process images from the eyes, so closing the eyes is often an effective method for increasing the Meditation meter level. Distractions, wandering thoughts, anxiety, agitation, and sensory stimuli may lower the Meditation meter levels. See “eSense Meters” above for details about interpreting eSense levels in general.
+===== Additional Data =====
+Headsets output additional data, including Raw Data, Brainwave Bands, and Signal Quality measurements. In addition, there are additional algorithms in some of the SDK's, which enable additional calculations including Eyeblinks. Please review the in-depth documentation SDK for a complete review of the additional outputs.
 ====== ThinkGear SDK for Mac OSX======

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