is 501.76 KB, has a resolution of 512x512 pixels and was uploaded on August 29, 2019 @ 4:17 pm by user: luismaier. It is filed under the tags: smile, text, symbol, number, cognitive training. Click the blue button at the top to freely download: Brain Neurofeedback Biofeedback Certification International Alliance Quantitative Electroencephalography Board png.