Cook, E. & Turpin, G. (1997). Differentiating orienting, startle and defense responses: The role of affect and its implications for psychopathology. In P. J. Lang, R. F. Simons & M. T. Balaban (Eds.), Attention and orienting: Sensory and motivational processes (pp.137-164). Hillsdale, NJ: Erlbaum.