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Table 1 Summary of participant and US characteristics by group

From: Neural substrates of individual differences in human fear learning: Evidence from concurrent fMRI, fear-potentiated startle, and US-expectancy data

  Conditionable (n = 24) Unconditionable (n = 15)
M SD M SD
ASI 7.9 3.8 11.1 5.3*
STAI-T 35.1 7.5 35.9 8.7
SPQ 4.9 5.7 5.0 6.0
US intensity (mA) 24.7 8.9 23.1 11.0
US evaluation
SAM Valence 6.8 0.9 6.9 0.8
SAM Arousal 3.9 1.3 3.9 1.2
  1. ASI, Anxiety Sensitivity Index; STAI-T, State–Trait Anxiety Inventory: Trait scale; SPQ, Spider Phobia Questionnaire; US, unconditioned stimulus; SAM, Self-Assessment Manikin. * p < .05.