Usually the onset of the startle response is a startle reflex reaction. Neuroticism is highly correlated with the startle reflex. It often decreases stiffness and improves quality of life and startle reflex. There are many various reflexes that can occur simultaneously during a startle response. Typically, episodic ataxia presents as bouts of ataxia induced by startle, stress, or exertion. Both sounds seem designed to startle potential predators. The physiological response of surprise falls under the category of the startle response. Males may attempt to startle predators by flashing their wings open. A burst of white noise is usually used as the acoustic startle stimulus. Abdominal wriggling is considered to be of startle value and discouraging to predators. CART peptides are also involved in fear and startle behavior. They then quickly snap shut in an effort to startle the predator. The squid reacted by jetting, inking, pattern change and other startle responses. Sometimes the entire body may jerk, just like a startle response. Cinematographer Gilbert Warrenton recalled that Leni used a gong to startle the actors.