Accounts of impairments in reaction time pervade the literature on alcoholism and range from simple tests of psychomotor speed to complex tasks that incorporate higher-level skills. An example of the former was reported by Pfefferbaum et al. (2009) who tested alcoholics and controls for fine-finger movement. The test was timed and required that participants turn a knurled post with the index finger and thumb of each hand separately, and then both hands. The alcoholics were slower than controls on both the unimanual and bimanual conditions. In another study, Kopera et al. (2012) found that alcoholics performed poorly on a simple reaction time task that was part of a larger neuropsychological assessment battery. The task required participants to push a button in response to a stimulus that appeared at random intervals in the same location on a computer screen. In a similar study, Ratti et al. (2002) found that alcoholics were impaired in both simple and choice reaction times. In the simple reaction time task, participants released or pressed a key when a target appeared. In the choice reaction time task,
