high sensation-seekers) may be able to test directly whether visual cortex activity to drug related images, and visual fixation, predicts drug initiation even before a traditional Stroop-related attentional bias develops. Although fMRI will likely never be a realistic screening tool due to cost concerns, it is possible that visual cortex activity could still be used as a biomarker for vulnerability to addiction or substance dependence itself through portable, lower-cost technologies such as EEG which can sample a more reliable signal from the visual cortical areas rather than deeper structures such as the orbitofrontal cortex or anterior cingulate cortex that are also involved in attention to drug cues.
