startle


Also found in: Dictionary, Thesaurus, Legal, Acronyms, Idioms, Wikipedia.

startle

(stăr′tĕl) [ME. sterten, stand up stiffly; move quickly]
A response to a sudden stimulus marked by jerking body movements and some or all of the following: defensive posture, tremors, sweating, widened pupils, and a temporary increase in pulse and respiratory rates.
References in periodicals archive ?
Startles success has shown the company has significant scope for future expansion.
Trigeminally induced startle in children with hyperekplexia.
A possible startle reaction was monitored by recording surface electromyographic (EMG) activity from the right OOc and SCM.
Recent human volunteers studies involving seated transient perturbations have suggested that the startle reflex forms part of the neuromuscular response to a rear-end collision.
The purpose of this study was to re-examine the processing mediating anticipation of affective stimuli by measuring the eyeblink startle reflex and skin conductance changes to disentangle the role of stimulus aversiveness (affective modulation) and emotional arousal (attentional modulation) over anticipatory responses.
During the 3rd stimulus presentation, the degree of startle was somewhat reduced in magnitude, the vocalization was still present but no movement of the arm occurred.
"Children with trauma but partial PTSD still [showed a] significant difference" he said, noting they could reduce their startle response by only 40%, compared with 50%-60% in controls.
PTSD symptom severity correlated with each child's ability to modulate his startle response, Dr.
Hyperekplexia, 'stiff baby syndrome' or 'startle disease' was first described in 1958 by Kirstein and Silfverskiold (1).