Anxiety (State)

A transitory emotional state in response to perceptions of threatening situations that varies in intensity and fluctuates over time.

Reference:
Spielberger, C. D. (1983). Manual for the State–Trait Anxiety Inventory (Form Y). Palo Alto, CA: Mind Garden.

Grös, D. F., Antony, M. M., Simms, L. J., & McCabe, R. E. (2007). Psychometric properties of the State-Trait Inventory for Cognitive and Somatic Anxiety (STICSA): comparison to the State-Trait Anxiety Inventory (STAI). Psychological Assessment, 19(4), 369-381. doi: 0.1037/1040-3590.19.4.369.