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Figure 1 - Vagal tone, development, and Gray's Motivational Theory: Toward an integrated model of autonomic nervous system functioning in psychopathology

Figure 1. Fictitious heart rate signals and associated power spectra. The top panels represent pure high-frequency variability (0.25 Hz), as associated with RSA. The middle panels represent low-frequency variability (0.07 Hz), primarily of sympathetic and nonneural origin. the bottom panels represent the combined signal including both high- and low-frequency components. Actual heart rate signals include spectral power at additional frequencies (adapted from Mezzacappa et al., 1994). 
Fictitious heart rate signals and associated power spectra. The top panels represent pure high-frequency variability (0.25 Hz), as associated with RSA. The middle panels represent low-frequency variability (0.07 Hz), primarily of sympathetic and nonneural origin. the bottom panels represent the combined signal including both high- and low-frequency components. Actual heart rate signals include spectral power at additional frequencies (adapted from Mezzacappa et al., 1994). 
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