Research associates processes of fear conditioning and extinction with treatment of anxiety and stress-related disorders. Manipulation of these processes may therefore be beneficial for such treatment. The current study examines the effects of electrical brain stimulation on fear extinction processes in healthy humans in order to assess its potential relevance for treatment enhancement. Forty-five participants underwent a 3-day fear conditioning and extinction paradigm. Electrical stimulation targeting the medial prefrontal cortex was applied during the extinction-learning phase (Day 2). Participants were randomly assigned to three stimulation conditions: direct-current (DC) stimulation, aimed at enhancing extinction-learning; low-frequency alternating-current (AC) stimulation, aimed at interfering with reconsolidation of the activated fear memory; and sham stimulation. The effect of stimulation on these processes was assessed in the subsequent extinction recall phase (Day 3), using skin conductance response and self-reports. Results indicate that AC stimulation potentiated the expression of fear response, whereas DC stimulation led to overgeneralization of fear response to non-reinforced stimuli. The current study demonstrates the capability of electrical stimulation targeting the medial prefrontal cortex to modulate fear extinction processes. However, the stimulation parameters tested here yielded effects opposite to those anticipated and could be clinically detrimental. These results highlight the potential capacity of stimulation to manipulate processes relevant for treatment of anxiety and stress-related disorders, but also emphasize the need for additional research to identify delivery parameters to enable its translation into clinical practice. Clinical trial identifiers: Modulation of Fear Extinction Processes Using Transcranial Electrical Stimulation; https://clinicaltrials.gov/show/NCT02723188;
NCT02723188 NCT02723188.
Results of this study indicate the potential capacity of tDCS to facilitate brain activation in mPFC regions underlying implicit regulation of emotion and accordingly modulate subjective emotional experiences.
Objective
: To examine whether the 1
st
COVID-19 lockdown in Israel affected emergency psychiatric presentations in a general hospital.
Method
: We studied files of patients who underwent psychiatric consultation in the emergency-room (ER) at the Tel-Aviv Sourasky Medical Center during a lockdown imposed in 2020. Parallel data were obtained from 2017-2019, as control.
Results
: The number of psychiatric consultations dropped during the lockdown period; an increased relative number of compulsory psychiatric hospitalizations was documented and a decreased rate of consented psychiatric hospitalizations.
Discussion
:
Less psychiatric patients approached the ER during the lockdown period, pointing to an urgent need to facilitate access to psychiatric care in future times of crisis.
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