| ASR | Acoustic startle response |
| Ch | Cochlea |
| CRN | Cochlear root nucleus |
| CPRN | Caudal pontine reticular nucleus |
| MN | Motor neuron |
| IC | Inferior colliculus |
| ISI | Interstimulus interval |
| ITI | Intertrial interval |
| SC | Superior colliculus |
| PPI | Prepulse inhibition |
| PPTg | Pedunculopontine tegmental nucleus |
| mPFC | Medial prefrontal cortex |
| Amyg | Amygdala |
| NAc | Nucleus accumbens |
| NAcD | Nucleus accumbens direct pathway |
| NAcI | Nucleus accumbens indirect pathway |
| VP | Ventral pallidum |
| VTA | Ventral tegmental area |
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