Preexposure to (un)predictable shock modulates discriminative fear learning between cue and context: An investigation of the interaction between fear and anxiety

► Presenting temporally unpredictable USs enhances context conditioning in humans. ► Preexposure to unsignaled USs retards fear learning more than signaled US-preexposure. ► Context conditioning induced by US-unpredictability might block new CS-US learning.