The parameters contain impulse noise, memory effect, scan correlated shift, coherent noise, random noise, dropped lines, inoperable detectors, saturated detectors, MTF, system resolution.

辐射性能参数包括脉冲噪声、记忆效应、扫描相关偏移、一致噪声、随机噪声、丢失行、不可操作探测器、饱和探测器、调制传递函数、系统分辨率。

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But the new study uses a different form of stimulation, known as transcranial random noise stimulation (TRNS), which applies randomly fluctuating currents (within certain parameters) to the head.

FORBES: Electrical Stimulation Might Improve The Brain's Capacity For Math

Six months later, when participants were contacted again and asked to solve calculations, researchers found that the group which had received five days of transcranial random noise stimulation showed "superior long-term performance, compared to sham controls".

BBC: Brain stimulation promises 'long-lasting' maths boost

But he said transcranial random noise stimulation could help more people because it had the potential to improve the ability to add, subtract or multiply a string of numbers in your head - not just new number learning.

BBC: Brain stimulation promises 'long-lasting' maths boost