Authors

  1. Neumann, Dawn Radice PhD
  2. Hammond, Flora MD
  3. Norton, James PhD
  4. Blumenthal, Terry PhD

Abstract

Objective: To determine the effectiveness of a modulated acoustic startle reflex paradigm with emotional imagery in studying physiological changes associated with emotional responses in persons with traumatic brain injury (TBI).

 

Setting: Outpatient rehabilitation hospital.

 

Participants: Six individuals with moderate to severe TBI. Mean age was 32 years and mean years postinjury were 9.9.

 

Method: The modulated acoustic startle reflex procedure involved imagery of emotional scripts (joy, anger, fear, and neutral) followed by a startle noise, versus startle noise alone (no script).

 

Measures: Eyeblink and skin conductance response, subjective arousal and valence ratings of the scripts, and general anger questionnaire.

 

Results: Startle blink responses following anger imagery were significantly smaller than those following fear (P = .006) and neutral (P = .023) imagery. Skin conductance response did not change significantly based on the content of the scripts (P = .070).

 

Conclusions: Large startle blink responses indicate avoidance of a stimulus. Our findings suggest that participants with TBI did not have an avoidant reaction to anger-inducing stimuli. Skin conductance response findings may imply arousal impairments. The modulated acoustic startle reflex was effective in measuring emotional responses; however, larger studies comparing persons with TBI with control groups are needed to further explore these findings.