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. 2023 Jan 18;240(11):2361–2401. doi: 10.1007/s00213-022-06307-1

Table 3.

Pharmacological interventions in the fear-potentiated startle test

Article Drug Species, strain Dose (mg/kg) Route, ITI (min) Group size (*) Reported effective dose (mg/kg);
Direction of effect; ANOVA effect
Non-cued startle Cued startle Difference score % FPS
GABA-ergic system
Benzodiazepines
  (Hijzen et al. 1995) Alprazolam Rat, Wi 1, 2, 3 IP, 30 12  = 

NR; ↓;

cue × dose

NR NR
  (Jenck et al. 2000) Alprazolam Rat, Wi 0.32, 1, 3.2 IP, 30 16 1, 3.2; ↓ 1, 3.2; ↓ NR NR
  (Steiner et al. 2011) Alprazolam Rat, F344 0.3, 1. 3 PO, NR 16 1, 3; ↓ 0.3, 1, 3; ↓ 0.3, 1, 3; ↓ 1, 3; ↓
  (Bill et al. 1992) Chlordiazepoxide Rat, LH 5 SC, 30 10 5; ↓ 5; ↓ NR NR
  (Guscott et al. 2000) Chlordiazepoxide Rat, SDR 0.3. 1, 3, 10 IP, 20 10 1, 3, 10; ↓ 1, 3, 10; ↓ 3, 10; ↓ NR
  (Guscott et al. 2000) Chlordiazepoxide Rat, SDR 0.3, 1, 3, 10 IP, 30 12 10; ↓ 10; ↓ 10; ↓ NR
  (Hijzen et al. 1995) Chlordiazepoxide Rat, Wi 2.5, 5, 10 IP, 20 12  = 

NR; ↓;

cue × dose

NR NR
  (Joordens et al. 1996) Chlordiazepoxide Rat, Wi 2.5, 5, 10 IP, 20 8  = 

NR; ↓;

cue × dose

NR NR
  (Joordens et al. 1996) Chlordiazepoxide Rat, Wi 2.5, 5, 10 IP, 20 12  = 

NR; ↓;

cue × dose

NR NR
  (Joordens et al. 1997) Chlordiazepoxide Rat, Wi 3.2, 10, 32 SC, 20 8  = 

NR; ↓;

cue × dose

NR NR
  (Risbrough et al. 2003) Chlordiazepoxide Mouse, DBA/1 J 10 IP, 30 6  = 

NR;

data shown

NR 10; ↓
  (Vale & Green 1996) Chlordiazepoxide Rat, HL 2.5, 5 IP, 30 10  =  2.5, 5; ↓ NR NR
  (Varty et al. 2008) Chlordiazepoxide Rat, Wi 1, 6, 10 IP, 30 12–14  =  NR NR 10; ↓
  (Zhao et al. 2018a) Chlordiazepoxide Rat, Wi 2.5, 5, 10 IP, 20 24 NR; ↓

NR; ↓;

cue × dose

10; ↓ NR
  (Zhao et al. 2018a) Chlordiazepoxide Rat, Wi 2.5, 5, 10 IP, 20 54 2.5, 5, 10 ↓ 2.5, 5, 10 ↓ NR 10; ↓
  Anthony & Nevins 1993) Diazepam Rat, SDR 1 IP, 30 8  = 

NR;

data shown

1; ↓ NR
  (Brodkin et al. 2002) Diazepam Rat, Wi 0.3, 1, 3 SC, 30 8  =  3; ↓ NR NR
  (Busse et al. 2004) Diazepam Rat, Wi 0.3, 1, 3 SC, 30 8  =  3; ↓ NR NR
  (Collado et al. 2002) Diazepam NR 0.6 IP, NR 8 NR NR NR NR
  (Collado et al. 2004) Diazepam Rat, SDR 0.6 IP, NR NR NR NR 0.6; ↓ NR
  (Davis 1979) Diazepam Rat, SDR 0.31, 0.62, 1.25, 2.5 IP, 10 12  = 

NR;

data shown

NR 0.31, 0.62, 1.25, 2.5; ↓
  (Gacsályi et al. 2017) Diazepam Rat, SDR 3 IP, 30 8–14 NR NR 3, ↓ NR
  (Helton et al. 1998) Diazepam Rat, LE 0.03, 0.1, 0.3. 1 IP, 30 8 NR NR 0.1, 0.3, 1; ↓ NR
  (Johnson et al. 2003) Diazepam NR 0.6 IP, NR NR NR NR 0.6; ↓ NR
  (Johnson et al. 2005) Diazepam Rat, SDR 0.6 IP, NR NR NR NR 0.6; ↓ NR
  (Johnson et al. 2005) Diazepam Rat, SDR 0.6 IP, NR NR NR NR 0.6; ↓ NR
  (Joordens et al. 1997) Diazepam Rat, Wi 1, 3.2, 10 SC, 30 8*2 external control  = 

NR; ↓;

cue × dose

NR NR
  (Martin et al. 2002) Diazepam Rat, RORO 0.3, 1, 3 IP. 30 12 1; ↓ 0.3, 1, 3; ↓ 0.3, 1, 3; ↓ NR
  (Nevins & Anthony 1994) Diazepam Rat, SDR 0.32, 1, 1.78, 3.2 IP. 30 8  = 

NR;

data shown

1, 1.78, 3.2; ↓ NR
  (Nevins & Anthony 1994) Diazepam Rat, SDR 0.31, 1, 1.78. 3.2 IP, 30 8  = 

NR;

data shown

1, 1.78, 3.2; ↓ NR
  (Pietraszek et al. 2005) Diazepam Rat, SDR 0.5, 1, 2 IP, 30 14 NR

NR;

data shown

2; ↓ NR
  (Risbrough et al. 2003) Diazepam Mouse, DBA/1 J 1, 3, 6 IP, 30 9 to 15  =  6; ↓ NR 3, 6; ↓
  (Rorick-Kehn et al. 2007) Diazepam Rat, SDR 0.6 PO, 30 8 NR NR 0.6; ↓ NR
  (Schulz et al. 2001) Diazepam Rat, SDR 1.25 IP, 30 10 NR NR NR 1.25; ↓
  (Steiner et al. 2012) Diazepam Rat, F344 1, 3, 10 PO, 30 12 10; ↓ 3, 10; ↓ NR NR
  (Tizzano et al. 2002) Diazepam Rat, SDR 0.3, 0.6, 1 IP, 30 8  = 

NR;

data shown

0.6, 1; ↓ NR
  (Tizzano et al. 2002) Diazepam Rat, SDR 0.6 IP, 30 8  = 

NR;

data shown

0.6; ↓ NR
  (Tizzano et al. 2002) Diazepam Rat, SDR 0.6 IP, 30 8  = 

NR;

data shown

0.6; ↓ NR
  (Zhang et al. 2016) Diazepam Rat, SDR 2 SC, 10 10 NR NR NR NR
  (Zhao et al. 2018b) Diazepam Rat, Wi 0.3, 1, 3 IP, 30 24 NR; ↓, main effect No cue × dose NR NR
  (Davis 1979) Flurazepam Rat, SDR 2.5, 10, 20 IP, 10 8  =  NR; ↓ NR NR; ↓
  (Hijzen & Slangen 1989) Midazolam Rat, Wi 0, 0.5, 1, 2 IP, 10 12 NR; ↓, main effect No cue × dose NR NR
  (Joordens et al. 1996) Utrecht Oxazepam Rat, Wi 1, 3, 10 PO, 60 12 NR; ↓, main effect No cue × dose NR NR
  (Joordens et al. 1996) Oss Oxazepam Rat, Wi 1, 3, 10 PO, 60 12 NR; ↓

NR; ↓;

cue × dose

NR NR
Barbiturates
  (Chi 1965) Amobarbital Rat, SDR 10, 20, 40 IP, 10 10  =  10, 20, 40; ↓ NR NR
GABAA receptor agonists
  (Hijzen et al. 1995) Alcohol Rat, Wi 500, 1000, 2000 IP, 30 12  =   =  NR NR
GABAA receptor partial agonists
  (Guscott et al. 2000) Bretazenil Rat, SDR 0.1, 0.3, 1, 3 PO, 30 10–12 1; ↓ 1, 3; ↓ 1, 3; ↓ NR
  (Guscott et al. 2000) Bretazenil Rat, SDR 0.1, 0.3, 1, 3 PO, 30 10–12  =  1; ↓ 1; ↓ NR
  (Guscott et al. 2000) FG 8205 Rat, SDR 0.3, 1, 3, 10 IP, 30 11 1, 3, 10; ↓ 1, 3, 10; ↓ 3, 10; ↓ NR
  (Guscott et al. 2000) FG 8205 Rat, SDR 0.3, 1, 3, 10 IP, 30 10–12  =  3, 10; ↓ 3, 10; ↓ NR
GABAA receptor α1 subunit agonist
  (Zhao et al. 2018b) Zolpidem Rat, Wi 1, 3, 10 IP, 15 24 3, 10; ↓ 10; ↓ 3; ↓ NR
GABAA receptor α2,3 subunit agonist
  (Atack et al. 2006) TPA023 Rat, SDR 0.3, 1, 3 PO, 30 15  =  1, 3; ↓ 1, 3; ↓ NR
  (Atack et al. 2011) TPA023B Rat, SDR 0.1, 0.3, 1 PO, 45 10  =  1; ↓ 0.3, 1; ↓ NR
GABAA receptor α5 subunit antagonist
  (Gacsályi et al. 2017) S44819 Rat, SDR 1, 3, 10 IP, 30 8–14  =  NR 1, 3; ↓ NR
GABAA inverse receptor agonists
  (Risbrough & Geyer 2005) FG-7142 Mouse, DBA/1 J 1, 3, 10, 20 IP, 5 8 to 12  =  20; ↓ NR 10, 20; ↓
  (Risbrough & Geyer 2005) FG-7142 Mouse, 129/SvEv 1, 3, 10, 20 IP, 5 8 to 12  =   =  NR 3; ↓
  (Hijzen & Slangen 1989) Lindane Rat, Wi 7.5, 15, 30 PO, 180 NR NR; ↑; main effect No cue × dose NR NR
  (Bijlsma et al. 2010) Pentylene tetrazole Rat, Wi 3, 10, 30 IP, 10 9 NR; ↓; main effect No cue × dose NR  = 
  (Hijzen & Slangen 1989) DMCM Rat, Wi 0, 0.1, 0.2, 0.4 IP, 6 NR NR; ↑; main effect No cue × dose NR NR
GABAA receptor antagonist
  (Davis et al. 1988)

Flumazenil

aka Ro 15–1788

Rat, SDR 2 NR, NR 5 NR NR NR NR
  (Tizzano et al. 2002) Flumazenil Rat, SDR 2 IP, 60 8 NR NR  =  NR
GABAB receptor positive allosteric modulator
  (Li et al. 2015) BHF177 Rat, Wi 20, 40 PO, 60 15–16  =   =  NR  = 
Serotonergic system
5-HT1A receptor partial agonists (azapirones)
  (Brodkin et al. 2002) Buspirone Rat, Wi 0.3, 1, 3 IP, 30 8  =   =  NR NR
  (Davis et al. 1988) Buspirone Rat, SDR 5 SC, 0 5 NR NR; ↓; cue x dose NR NR
  (Li et al. 2015) Buspirone Rat, Wi 1, 3 SC, 10 12  =  3; ↓ NR 3; ↓
  (Mansbach & Geyer 1988) Buspirone Rat, SDR 1.25, 2.5, 5 SC, 10 10 1.25, 5 ↑  =  2.5, 5.0; ↓ 2.5, 5.0; ↓
  (Nevins & Anthony 1994) Buspirone Rat, SDR 0.56, 1, 3.2, 5.6 IP, 30 8  =  NR; data shown 1, 3.2, 5.6; ↓ NR
  (Nevins & Anthony 1994) Buspirone Rat, SDR 0.56, 1, 3.2, 5.6 IP, 30 8  =  NR; data shown 1, 3.2, 5.6; ↓ NR
  (Risbrough et al. 2003) Buspirone Mouse, DBA/1 J 2.5, 5, 10 SC, 30 9 to 11  =   =  NR 5, 10; ↓
  (Steiner et al. 2012) Buspirone Rat, F344 10, 30, 100 PO, 30 12 10, 30, 100; ↑ 100; ↓ NR NR
  (Mansbach & Geyer 1988) Gepirone Rat, SDR 3, 10 IP, 10 7 to 8  =   =   =  10; ↓
  (Davis et al. 1988) Ipsapirone Rat, SDR 10, 20, 40 IP, 0 5 40; ↓ 40; ↓ 40; ↓ NR
  (Mansbach & Geyer 1988) Ipsapirone Rat, SDR 1, 3, 5.6, 10 SC, 10 10  =   =  5.6; ↓ 3.0, 5.6; ↓
5-HT1A biased receptor agonists
  (Zhao et al. 2019) F13714 Rat, Wi 0.01, 0.04, 0.16 IP, 60 12 0.04, 0.16; ↓ 0.16; ↓ NR NR
  (Zhao et al. 2019) F15599 Rat, Wi 0.01, 0.04, 0.16 IP, 60 12  =   =  NR NR
5-HT1A receptor agonists
  (Davis et al. 1988) 8-OH-DPAT Rat, SDR 2.5, 5, 10 IP, 0 5 (10) NR NR no dose effect NR
  (Joordens et al. 1998) 8-OH-DPAT Rat, Wi 0.03, 0.1, 0.3 SC, 10 12  =  0.3; ↓ NR NR
  (Joordens et al. 1998) 8-OH-DPAT Rat, Wi 0.3 SC, 10 35 (36) NR NR 0.3; ↓ NR
  (Mansbach & Geyer 1988) 8-OH-DPAT Rat, SDR 0.125, 0.5 SC, 10 10  =   =  0.125, 0.25; ↓ 0.125, 0.25; ↓
  (Zhao et al. 2019) R( +)-8-OH-DPAT Rat, Wi 0.03, 0.1, 0.3 SC, 10 12 0.03, 0.1, 0.3; ↓ 0.03, 0.1, 0.3; ↓ NR NR
  (Joordens et al. 1998) Flesinoxan Rat, Wi 10 PO, 60 35 (36) NR NR 10; ↓ NR
  (Joordens et al. 1996) Utrecht Flesinoxan Rat, Wi 1, 3, 10 PO, 60 12  =  NR; ↓; cue x dose NR NR
  (Joordens et al. 1996) Oss Flesinoxan Rat, Wi 1, 3, 10 PO, 60 12 dose NR; ↓ NR; ↓; cue x dose NR NR
5-HT1A receptor antagonists
  (Joordens et al. 1998) DU125,530 Rat, Wi 1, 3, 10 SC, 30 12  =  1, 3, 10; ↓ NR NR
  (Joordens et al. 1998) Pindolol Rat, Wi 3, 10, 30 SC, 30 11  =  10, 30; ↓ NR NR
  (Joordens et al. 1998) WAY100,635 Rat, Wi 0.1, 0.3, 1 SC, 30 12  =  1; ↓ NR NR
  (Risbrough & Geyer 2005) WAY100,635 Mouse, DBA/1 J 0.3 IP, 10 8 to 12  =   =  NR NR
  (Zhao et al. 2019) WAY100,635 Rat, Wi 0.1, 0.3, 1 SC, 30 12 0.1, 0.3, 1; ↓; main effect no cue x dose NR NR
5-HT2c receptor agonists
  (Bijlsma et al. 2010) m-CPP Rat, Wi 0.5, 1, 2 IP, 25 8 NR; ↓, main effect no cue x dose NR 2; ↑
  (Mansbach & Geyer 1988) m-CPP Rat, SDR 0.25, 1 SC, 10 10 1; ↓ 1; ↓  =   = 
  (Risbrough & Geyer 2005) m-CPP Mouse, DBA/1 J 0.3, 1, 3 SC, 15 8 to 12 3; ↑ 3; ↑ NR  = 
5-HT2a, 2c receptor antagonists
  (Davis et al. 1988) Cinanserin Rat, SDR 10 IP, NR 5 NR NR NR NR
  (Mansbach & Geyer 1988) Methysergide Rat, SDR 0.3, 1, 3, 10 SC, 10 7 to 8 1; ↑  =   =   = 
  (Davis et al. 1988) Cyproheptadine Rat, SDR 5 NR, NR 5 NR NR NR NR
  (Martin et al. 2002) SB-242084 Rat, RORO 0.1, 0.3, 1 IP, 30 12  =   =   =  NR
5-HT3 receptor antagonists
  (Nevins & Anthony 1994) (R)-Zacopride Rat, SDR 0.001, 0.01, 0.1, 1 IP, 45 8  =  NR; data shown 1; ↓ NR
  (Nevins & Anthony 1994) (R)-Zacopride Rat, SDR 0.001, 0.01, 0.1, 1 IP, 45 8  =  NR; data shown 0.01, 0.1, 1; ↓ NR
  (Nevins & Anthony 1994) Granisetron Rat, SDR 0.001, 0.01, 0.1, 1 IP, 45 8  =  NR; data shown  =  NR
  (Nevins & Anthony 1994) Granisetron Rat, SDR 0.001,0,01, 0,1, 1 IP, 45 8  =  NR; data shown 0.01, 0.1, 1; ↓ NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.001, 0.01, 0.1, 1 IP, 45 8  =  NR; data shown  =  NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.001, 0.01, 0.1, 1 IP, 45 8  =  NR; data shown 0.001, 0.01, 0.1, 1; ↓ NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.1 IP, 45 8  =  NR; data shown 0.1; ↓ NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.1 IP, 45 8  =  NR; data shown  =  NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.1 IP, 45 8  =  NR; data shown 0.1; ↓ NR
  (Nevins & Anthony 1994) Ondansetron Rat, SDR 0.1 IP, 45 8  =  NR; data shown 0.1; ↓ NR
Bill et al. 1992 WAY100289 Rat, LH 0.003, 0.03, 0.3 SC, 30 10 NR NR NR NR
5-HT re-uptake inhibitors (SSRIs)
  (Steiner et al. 2012) Fluoxetine Rat, F344 3, 10, 30 PO, 45 12  =   =  NR NR
  (Joordens et al. 1996) Fluvoxamine Rat, Wi 5, 10, 20 PO, 60 12  =   =  NR NR
  (Joordens et al. 1996) Fluvoxamine Rat, Wi 5, 10, 20 PO, 60 12  =   =  NR NR
  (Steiner et al. 2012) Sertraline Rat, F344 10, 30, 100 PO, 60 12 30, 100; ↑ 30, 100; ↑ NR NR
TCAs
  (Hijzen et al. 1995) Amitriptyline Rat, Wi 2.5, 5, 10 IP, 60 12  =   =  NR NR
  Cassella 1985 Imipramine Rat, SDR 5, 10 IP, 0 10  =   =   =  NR
  (Nevins & Anthony 1994) Imipramine Rat, SDR 5, 10 IP, NR 8  =  NR; data shown  =  NR
5-HT releaser
  (Davis et al. 1988) p-Chloro-amphetamine Rat, SDR 5 IP, 15 5 NR NR NR NR
Glutamatergic system
mGluR1antagonists
  (Pietraszek et al. 2005) EMQMCM Rat, SDR 1.25, 2.5, 5 IP, 30 16  =  NR; data shown 5; ↓ NR
mGLuR5 antagonists
  (Carcache et al. 2011) 15i NR 0.3, 1, 3 PO, 60 10 NR NR;data shown 1, 3; ↓ NR
  (Brodkin et al. 2002) MPEP Rat, Wi 3, 10, 30 IP, 60 8  =  10, 30; ↓ NR NR
  (Schulz et al. 2001) MPEP Rat, SDR 0.3, 3, 10 PO, 60 NR  =  30; ↓ 30; ↓ NR
  (Cosford et al. 2003) MPEP NR NR IP, NR 8 NR NR NR NR
  Busse et al. 2004 MTEP Rat, Wi 0.3, 1, 3 IP, 60 8  =  1, 3; ↓ NR NR
  (Pietraszek et al. 2005) MTEP Rat, SDR 0.6, 1.25, 2.5, IP, 30 14  =  NR, data shown 2.5, 5; ↓ NR
  (Cosford et al. 2003) MTEP NR NR IP, NR 8 NR NR NR NR
  (Roppe et al. 2004a) 5-[(2-Methyl-1,3-thiazol-4-yl)ethynyl]-2,30-bipyridine (MTEP derivate NR NR PO, 60 NR NR NR NR NR
  (Roppe et al. 2004b) 3-(5-pyridin-2-yl-2H-tetrazol-2-yl)benzonitrile (MTEP derivate) Rat, Wi NR PO, 60 8 NR NR NR NR
mGluR2,3 agonists
  (Collado et al. 2004) (2S,1'S,2'R,3'R)-2-(2¢-carboxy-3¢-hydroxymethylcyclopropyl) glycine (( +)-3) Rat, SDR 0.003, 0.04, 0.3, 3 µg/kg , NR NR NR NR 0.3, 3 µg/kg; ↓ NR
  (Collado et al. 2002) (2S,1'S,2'S,3'R)-2-(2¢-carboxy-3'-methylcyclopropyl) glycine NR NR PO, NR 8 NR NR NR NR
  (Johnson et al. 2005) APPES Rat, SDR 0.0001, 0.001, 0.01, 0.1 SC, NR NR NR NR 0.1; ↓ NR
  (Helton et al. 1998) (-)-LY366563 Rat, LE 1, 3, 10 PO, 60 16  =  NR  =  NR
  (Helton et al. 1998) ( +)-LY354740 Rat, LE 0.01, 0.03, 0.1, 1, 3, 10 PO, 60 16  =  NR 0.1, 1, 3, 10; ↓ NR
  (Tizzano et al. 2002) ( +)-LY354740 Rat, SDR 0.3 IP, 30 8 NR NR 0.3; ↓ NR
  (Tizzano et al. 2002) ( +)-LY354740 Rat, SDR 0.003, 0.03, 0.3, 3 IP, 30 8  =  NR, data shown 0.3, 3; ↓ NR
  (Tizzano et al. 2002) ( +)-LY354740 Rat, SDR 0.3 IP, 30 8  =  NR, data shown 0.3; ↓ NR
  (Rorick-Kehn et al. 2007) LY404039 Rat, SDR 0.03, 0.3, 3, 30 µg/kg PO, 30 8 NR NR 3, 30 µg/kg; ↓ NR
  (Rorick-Kehn et al. 2007) LY404039 Rat, SDR 30 µg/kg PO, 30 8 NR NR 30 µg/kg; ↓ NR
  (Johnson et al. 2003) LY487379 NR 0.03, 0.3, 3 IP, NR NR NR NR 3; ↓ NR
  (Johnson et al. 2005) LY487379 (aka 4-MPPTS) Rat, SDR 0.001, 0.01, 0.1, 1 SC, NR NR NR NR 1; ↓ NR
mGluR2,3 antagonists
  (Tizzano et al. 2002) LY341495 Rat, SDR 1 SC, 60 8  =  NR, data shown  =  NR
  (Tizzano et al. 2002) LY341495 Rat, SDR 1 SC, 60 8  =  NR, data shown  =  NR
  (Rorick-Kehn et al. 2007) LY341495 Rat, SDR 1 SC, 60 8 NR NR  =  NR
  (Johnson et al. 2003) LY341495 NR 3 SC, NR NR NR NR  =  NR
GlyR partial agonists
  Anthony & Nevins 1993) 1-aminocyclopropanecarboxylate Rat, SDR 10, 30, 100, 200 IP, 15 8  =  NR; data shown 200; ↓ NR
  Anthony & Nevins 1993) 1-aminocyclopropanecarboxylate Rat, SDR 200, 300, 400, 500 IP, 15 8  =  NR; data shown 200, 300, 400, 500; ↓ NR
  Anthony & Nevins 1993) ( +)-HA-966 Rat, SDR 1, 3, 10 IP, 15 8  =  NR; data shown 10, 30; ↓ NR
  Anthony & Nevins 1993) d-Cycloserine Rat, SDR 10, 30, 100, 300 IP,15 8  =  NR; data shown 30, 100, 300; ↓ NR
  (Anthony & Nevins 1993) d-Cycloserine Rat, SDR 10, 30, 100, 300 IP,15 8  =  NR; data shown 30, 100, 300; ↓ NR
  (Walker et al. 2002) d-Cycloserine Rat, SDR 15 IP, 30 5 (6) NR NR NR  = 
GlyR antagonists
  (Anthony & Nevins 1993) 7-chlorokynurenate Rat, SDR 10, 30, 100 IP, 15 8  =  NR; data shown 30, 100; ↓ NR
  (Walker et al. 2002) ( ±)-HA-966 Rat, SDR 6 IP, 40 5 (6) NR NR NR  = 
GluN receptor antagonists
  Anthony & Nevins 1993) 2-amino-7-phosphonoheptanote Rat, SDR 10, 30 IP, 15 8  =  NR; data shown 10, 30; ↓ NR
  Anthony & Nevins 1993) 3-(2-carboxypiperazin-4-yl)propyl 1-phosphonate (CPP) Rat, SDR 3 IP, 15 8  =  NR; data shown 3; ↓ NR
  (Zhang et al. 2016) Phencyclidine Rat, SDR 1.5 IP, 10 10 NR NR NR NR
Noradrenergic system
α1-adrenoreceptor antagonists
  (Davis 1979) WB4101 Rat, SDR 1 IP, 10 10  =  NR NR  = 
α2-adrenoreceptor antagonists
  (Risbrough & Geyer 2005) Atipamezole HCL Mouse, DBA/1 J 0.3, 1, 3 SC, 30 8 to 12 3; ↑ 3; ↑ NR  = 
  (Davis 1979) Piperoxane Rat, SDR 0.25, 1 IP, 10 10  =  1; ↑ NR 1; ↑
  (Bijlsma et al. 2010) Yohimbine Rat, Wi 0.25, 0.5, 1 IP, 10 11  =  0.25, 1; ↑  =   = 
  (Davis 1979) Yohimbine Rat, SDR 0.125, 0.25 IP, 10 10  =  0.25; ↑ NR 0,25; ↑
  (Davis et al. 1988) Yohimbine Rat, SDR 5 IP, NR 5 NR NR NR NR
  (Risbrough & Geyer 2005) Yohimbine Mouse, DBA/1 J 0.1, 1, 10 SC, 30 8 to 12  =  NR; ↓ NR 10; ↓
α2-adrenoreceptor agonists
  (Davis 1979) Clonidine Rat, SDR NA IP, 10 µg/kg NR NR; ↓ NR; ↓ NR NR; ↓
β1,2-adrenoreceptor antagonists
  (Davis 1979) Propranolol Rat, SDR 20 IP, 10 10  =  NR NR  = 
Dopaminergic system
D1 receptor agonists
  (de Oliveira et al. 2006) SKF 38,393 Rat, Wi 5, 10 IP, 10 20  =   =  NR NR
D1 receptor antagonists
  (de Oliveira et al. 2006) SCH 23,390 Rat, Wi 0.05, 0.1 IP, 30 20  =   =  NR NR
D2 receptor agonists
  (de Oliveira et al. 2006) Quinpirole Rat, Wi 0.1, 0.25 IP, 10 15  =  0.1, 0.25; ↓ NR NR
D2 receptor antagonists
  (Hijzen et al. 1995) Haloperidol Rat, Wi 0.065, 0.125, 0.25 IP, 30 12  =  NR; ↓; cue x dose NR NR
  Muthuraju 2014 Haloperidol Rat, Wi 0.1, 0.5 IP, 5 10–17  =  0.1, 0.5; ↓ NR NR
  (Nevins & Anthony 1994) Haloperidol Rat, SDR 0.1, 0.3 IP, NR 8  =  NR; data shown  =  NR
  (de Oliveira et al. 2006) Sulpiride Rat, Wi 20, 40 IP, 10 15  =   =  NR NR
Psychostimulants
  (Vale & Green 1996) d-Amphetamine Rat, LH 0.5, 1 IP, 30 11–12  =   =  NR NR
  (Hijzen et al. 1995) d-Amphetamine Rat, Wi 0.6, 1.2, 2.4 IP, 15 12  =  NR; ↓; cue x dose NR NR
Opioid system
μ receptor partial agonists
  (Glover & Davis 2008) Buprenorphine Rat, SDR 0.004, 0.0075, 0.015, 0.03, 0.25 SC, 0 45 (NR)  =  NR; ↓ 0.0075, 0.015, 0.03, 0.25; ↓ NR
μ receptor agonists
  (Davis 1979) Morphine Rat, SDR 0.63, 2.5, 10 IP, 10 8  =  NR; ↓ NR NR
  (Davis 1979) Morphine Rat, SDR 10 IP, 10 8  =  10; ↓ NR NR
  (Glover & Davis 2008) Morphine Rat, SDR 0.03, 0.25, 0.63, 2.5, 10 SC, 0 45 (NR)  =  NR; ↓ 0.63, 2.5, 10; ↓ NR
  (Hijzen et al. 1995) Fentanyl Rat, Wi 0.0025, 0.01, 0.04 IP, 30 12  =   =  NR NR
μ receptor antagonists
  (Davis 1979) Naloxone Rat, SDR 2 IP, 20 8  =   =  NR NR
  (Davis et al. 1988) Naloxone Rat, SDR 5 NR, NR 5 NR NR NR NR
  (Hijzen et al. 1995) Naloxone Rat, Wi 2.5, 5, 10 IP, 25 12  =   =  NR NR
  (Glover & Davis 2008) Naloxone Rat, SDR 0.5 SC, 5 NR NR NR  =  NR
Neuropeptides
BB1,2 receptor antagonists
  (Merali et al. 2006) PD176252 Rat, NR 5, 10 IP, 20 9  =  5, 10; ↓ NR NR
Cholecystokinin system
CCK2 receptor agonists
  (Hebb et al. 2003) Boc CCK-4 Mouse, CD1 5, 15 µg/kg SC, 30 5  =  15; ↓ NR NR
CCK2 receptor antagonists
  (Josselyn et al. 1995) L-365,260 Rat, Wi 0.1, 1, 10 IP, 15 16 (11)  =  1, 10; ↓ NR NR
CRF system
CRF1 receptor antagonists
  (Bijlsma et al. 2015) CP154,526 Rat, Wi (wt) 10 µg/kg IP, 30 9–10 NR; ↓; main effect no cue x dose NR NR
  (Chen et al. 1997) CP-154,526 Rat, SDR 17.8 PO, 60 NR (12)  =  NR 17.8; ↓ NR
  (Risbrough et al. 2009) NBI-30775 Mouse, C57BL/6 J 20 IP, 30 7–13 NR NR NR  = 
Ghrelin-R1a agonist
  (Toufexis et al. 2016) Ghrelin Rat, SDR male 10 SC, 20 16  =  NR NR  = 
  (Toufexis et al. 2016) Ghrelin Rat, SDR female 10 SC, 20 16  =  NR NR  = 
NOP receptor agonists
  (Varty et al. 2008) SCH 221,510 Rat, Wi 3, 6, 10 PO, 120 12–14  =  NR NR NR; ↓
  (Jenck et al. 2000) Ro 64–6198 Rat, Wi 1, 3.2, 10 IP, 30 16 3.2, 10; ↓ 3.2, 10; ↓ NR NR
  (Lu et al. 2011) SCH 655,842 Rat, Wi 1, 3, 10 PO, 60 12–15  =  NR NR 3, 10; ↓
NTS1 receptor agonists
  (Shilling & Feifel 2008) PD149163 Rat, SDR 0.01, 0.1, 1.0 SC, 20 7–10  =  NR NR 1; ↓
  (Shilling & Feifel 2008) PD149163 Rat, SDR 1 SC, 20 16 1; ↓ NR NR 1; ↓
OX1,2 receptor antagonists
  (Steiner et al. 2012) Almorexant Rat, F344 30, 100, 300 PO, 60 12 300; ↓ 100, 300; ↓ NR NR
OX1 receptor antagonists
  (Steiner et al. 2013) ACT-335827 Rat, F344 30, 100, 300 PO, 60 16  =  300; ↓ NR NR
OT receptor agonists
  (Ayers et al. 2011) Oxytocin Rat, SDR 0.01, 0.1, 1.0 µg/kg SC, 30 12 0.001, 0.1; ↓  =  NR  = 
  (Ayers et al. 2016) Oxytocin Rat, SDR 0.1 SC, 30 55 (54) NR; ↓; main effect no cue x dose NR  = 
  (Missig et al. 2010) Oxytocin Rat, SDR 0.01, 0.1, 1 µg/kg SC, 30 12 NR; ↓; main effect no cue x dose NR  = 
Secretin receptor agonists
  (Myers et al. 2004) Secretin Rat, SDR 1, 3, 10, 30, 100 µg/kg IP, 0 16 (8–12)  =  NR 10; ↓  = 
Miscellaneous
Cholinergic system
nACh receptor agonists
  (Hijzen et al. 1995) Nicotine Rat, Wi 0.4, 0.8, 1.6 IP, 15 12  =   =  NR NR
  (Vale & Green 1996) Nicotine Rat, LH 0.05, 0.1, 0.4 SC, 0 10–12  =   =  NR NR
  (Vale & Green 1996) Nicotine Rat, LH 0.1 SC, 0 10  =   =  NR NR
Endocannabinoid system
CB1 receptor antagonists
  (Chhatwal et al. 2005) Rimonabant Rat, SDR 5 IP, 60 8 NR NR NR  = 
Endocannabinoid reuptake inhibition
  (Chhatwal et al. 2005) AM404 Rat, SDR 10 IP, 60 8  =  NR NR  = 
Glucocorticoid system
MR/GR receptor agonists
  (de Oliveira et al. 2013) Corticosterone Rat, Wi 3, 6 IP, 0 6 (12)  =   =  NR NR
Corticosterone synthesis blocker
  (de Oliveira et al. 2013) Metyrapone Rat, Wi 30, 60 IP, 20 6 (12)  =   =  NR NR
Other
Voltage dependent sodium channel blocker
  (Hijzen et al. 1995) Carbamazepine Rat, Wi 5, 10, 20 IP, 60 12  =   =  NR NR

FPS fear potentiation, IP intraperitoneally, ITI inter-trial interval, LE Long Evans, NR not reported, PO per os, SC subcutaneously, SDR Sprague–Dawley rat, Wi Wistar, wt wild type, CRF corticotropin-releasing factor, GluN ionotropic glutamate receptor, GlyR glysine receptor, m-CPP m-chlorophenylpiperazine, mGlu metabotropic glutamate, MR/GR mineralocorticoid receptor/glucocorticoid receptor, nACh nicotinic acetylcholine, NOP nociceptin opioid peptide, NTS neurotensin, OT oxytocin, OX orexin, ↓ response reduced relative to vehicle control condition, ↑ response increased relative to vehicle control condition, cue × dose interaction effect in ANOVA

(*) group size of intervention group is given in brackets if the group size of the experimental group differed from that of the vehicle-control group