A noninvasive, electrically powered device/device assembly intended for use by a layperson outside a clinical setting to apply weak continuous (not pulsed) electrical current (typically up to 2 mA) across the skin to the wearer's brain to increase neuroplasticity, and improve concentration and working memory. The technique is commonly referred to as transcranial direct current stimulation (tDCS). It is available in a variety of forms (e.g., wearable headset) and includes controls and multiple electrodes; additional accessories (e.g., sponges intended to be soaked in salt water to conduct the current) may include additional accessories.