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Although some of the studies in these categories were conducted earlier than the last age over 50 year, their inclusion in the consideration of these trends is essential, hence their mention below. In a longitudinal study, researchers study the same people age over 50 over a period of time. Longitudinal studies allow us to see whether people change over time. To our knowledge, only five longitudinal studies have yet been conducted. Because these are newer, we are reporting on them in some age over 50 depth. In one, 41 adolescents played either a hand-to-hand fighting game (Mortal Kombat), a violent horror game (Resident Evil), or a sports game (NBA Live) once a week for three weeks (Ballard, Panee, Engold, & Hamby, 2001). Physiological arousal (heart rate and blood pressure) and emotions (facial smiling and disgust displays) were measured during play, and self-reported anger, frustration, arousal, and relaxation were measured post-play. Heart rate, blood pressure, and facial displays of disgust decreased significantly over the three play periods, showing desensitization with repeated exposure.
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