Motivated and controlled attention to emotion: Time-course of the late positive potential

The aim of the present study was to uncover the temporal dynamics of face recognition as a function of reward. Event-related potentials (ERPs) were recorded during the encoding and the subsequent old/new memory test in response to faces that could be associated with a monetary reward. The behavioral results showed that faces associated with reward at both encoding and retrieval were recognized better than the unrewarded ones. ERP responses highlighted that successful encoding predictive of subsequent memory was greater for faces associated with reward than for faces without reward-driven motivational learning. At retrieval, an early positive-going component was elicited for potentially rewarded faces on frontal regions, while the occipito-temporal N170 component showed priming effects as a function of reward. Later on, larger centro-parietal ERP components, related to recognition memory, were found selectively for reward-associated faces. Remarkably, electrophysiological responses varied in a graded manner, with the largest amplitude yielded by faces with double reward, followed by faces associated with reward only at encoding. Taken together, the present data show that the processing of outcome expectations affects face structural encoding and increases memory efficiency, yielding a robust and sustained modulation over frontal and temporal areas where reward and memory mechanisms operate in conjunction.

Positively reinterpreting negative experiences is important for psychological well-being and represents a key mechanism of cognitive-behavioral therapies for emotional problems. Yet, little is known about the neural mechanisms that underlie this process and how they relate to clinically relevant individual differences. Here we demonstrate using event-related potentials (ERPs) that positively reappraising distress-inducing images is associated with early increases in frontal control activity and later decreases in parietal arousal-related activity. Moreover, we show that people's chronic tendencies to reappraise versus worry modulate neural activity in opposing directions-trait reappraisal predicts decreases in parietal arousal-related activity during positive reappraisal implementation whereas worry predicts increases in the same waveform. These findings provide novel insights into the neural time course of positive reappraisal. They also speak to the potential clinical utility of neurophysiological measures as relatively inexpensive, noninvasive biomarkers that could serve as risk indicators and treatment mediators.

Previous research suggests that intense, emotional pictures at fixation elicit an early posterior negativity (EPN) and a late positive potential (LPP) despite manipulations of spatial inattention and perceptual load. However, if high emotional intensity protects against such manipulations, then these manipulations should reduce emotional effects on EPN and LPP more strongly for medium than for intense emotional pictures. To test this prediction, pictures that were high negative, medium negative, or neutral were shown at fixation, and a small letter string was superimposed on the picture center. When participants attended the pictures, there were clear emotional effects on EPN and LPP. When participants attended the letter string, the emotional effects on LPP decreased; this decrease was smaller for medium than for high negative pictures. Thus, opposite of predictions, spatial inattention reduced the emotional effects more strongly for high than for medium negative pictures. As a manipulation of perceptual load, participants performed the letter task with one, three, or six relevant letters. Irrespective of load, EPN and LPP were similar for high and medium negative pictures. Our findings suggest that high negative valence does not protect EPN and LPP more strongly from effects of spatial inattention and perceptual load than does medium negative valence.