Inhibition of hypervigilance in the treatment of traumatic simple phobias: three case examples

Changes in temporal attention inhibition following prolonged exposure and sertraline in the treatment of PTSD

OBJECTIVE

Attentional inhibitory deficits expressed as difficulty ignoring irrelevant stimuli in the pursuit of goal-directed behavior may serve as a fundamental mechanism of posttraumatic stress disorder (PTSD). Evidence of inhibitory processes as central to extinction suggests that exposure-based treatments may act more directly on the inhibitory deficits implicated in PTSD, whereas, in facilitating serotonergic neurotransmission, selective serotonin reuptake inhibitors (SSRIs) may be less direct and bring about general neurochemical changes in the fear circuitry. If these inhibitory deficits underlie PTSD, then inhibition should improve with successful treatment, with those treated with prolonged exposure (PE) potentially resulting in greater changes in inhibition than those treated with sertraline.

METHOD

Changes in temporal attentional inhibition, using an attentional blink (AB) paradigm, were examined at pre- and posttreatment in 49 individuals (74.5% female, 66.7% Caucasian, age M = 37.69, SD = 12.8 years) with chronic PTSD. Participants completed 10 weeks of either PE or sertraline.

RESULTS

Individuals who made greater improvements with PE showed faster improvements in temporal inhibition on the critical inhibitory lag of AB than those who made greater improvements with sertraline (d = 0.94). These changes could not be accounted for by basic attention.

CONCLUSIONS

Greater improvement in fundamental attentional inhibitory processes with better treatment response to PE, compared with sertraline, suggests potential specificity in how PTSD treatments normalize inhibitory processes, such that exposure-based treatments like PE may target inhibitory processes and improve basic inhibitory functioning.

The Traumatic Process: Conceptualization and Treatment

Traumatic stress stems from a threat to an individual's or a group's very existence. The impact of the existential threat may be compounded by an inability to cope, which affects the perception of helplessness and loss of lawfulness. A model is proposed in which the traumatic process is conceptualized to develop through three stages: (1) alert; (2) impact; and (3) post-trauma. In this model, treatment of traumatic stress emphasizes the need to control and expand life, and to achieve lawfulness and meaningfulness. In the proposed model of treatment, there are essential differences at each of the stages of the traumatic process: (1) primary prevention at the stage of alert focuses on planning strategies for coping; (2) secondary prevention at the stage of impact is based on forward treatment and debriefing; and (3) tertiary treatment at the post-trauma stage attends to coping with internal chaos and arbitrariness.