Functional neuroimaging technologies like single photon emission computerized tomography, or SPECT, and positron emission tomography, or PET, now enable scientists to monitor changes in brain activity.

• 如今，诸如单光子发射计算机扫描断层成像(SPECT)及正电子发射型断层成像(PET)等功能性大脑成像技术使科学家能够监测大脑活动的变化。