Spatiotemporal dynamics of the hedonic processing of chocolate images in individuals with and without trait chocolate craving.

The spatiotemporal dynamics of the hedonic response to chocolate images was investigated in healthy participants high and low in trait-chocolate craving employing high-density ERPs. There were two sessions: (1) before and (2) after satiety for chocolate. Among cravers, chocolate stimuli evoked a positive amplitude ERP enhancement over the anterior frontal scalp (250-350 ms) that was not modified by satiety and that source localized to the left lateral orbitofrontal cortex.

Early frontal responses elicited by physical threat words in an emotional Stroop task: Modulation by anxiety sensitivity.

High-density brain electrical activity elicited by physical threat, positive and neutral words were recorded in 33 healthy individuals screened for high or low anxiety sensitivity (AS) during a modified emotional Stroop task. The paradigm allowed the separate assessment of block and mixed-trial effects. In the block analysis, a significant emotional RT slowing was observed along with the modulation of a frontocentral negativity (350-400ms) in the high AS group only.