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. Author manuscript; available in PMC: 2008 Jun 26.
Published in final edited form as: Neuropsychologia. 2007 Dec 15;46(5):1267–1278. doi: 10.1016/j.neuropsychologia.2007.12.003

Figure 2.

Figure 2

Experimental design. (A) The experimental session involved three main phases. (B) Structure of the stimuli employed during conditioning. (C) Letter- detection task. Four different blocks were employed following a 2 TYPE (safe, threat) × 2 LOAD (easy, hard) structure (indicated via an initial instruction display at the beginning of a block). Individual trials lasted 2.5 s. At the end of each run, subjects performed “booster” trials to minimize the extinction of conditioned responses. Stimuli are not drawn to scale.