Figure 1.
Sequence scheme over time of image presentation in terms of arousal and valence levels. The y-axis relates to the official IAPS score, whereas the x-axis relates to the time. After the first 5 min baseline (b) acquisition, the neutral sessions (Nx) alternate with resting-state sessions Rx and the arousal ones Ax. Along the time, the red line followsthe four arousal sessions having increasing intensity of activation. The dotted green line indicates the valence levels, distinguishing negative and positive levels within an arousing session. (Online version in colour.)