expand and solidify this table. Research of this sort, which attempts to relate measures of different facets of impulsivity across tasks and across species, is in its infancy. Many unresolved questions remain to be answered. For example, initial studies suggest that positive and negative urgency and sensation seeking are most readily associated with aspects of alcohol use; are the constructs of lack of planning and lack of perserverance of little relevance to the field of alcohol research, or are they perhaps related to components of the dependence process that have yet to be studied? Or, are these low conscientiousness traits most relevant to problem drinking for only a subset of the population, such as individuals with attention deficit-hyperactivity disorder? More broadly, are there moderators of the influence of each of the traits that merit investigation? Are there laboratory tasks or animal paradigms that tap into the construct of human sensation seeking, which has been associated with alcohol use and problems across multiple independent studies? Is it possible to develop tasks that differentiate positive and negative urgency? And finally, research will be needed to identify how these different facets and measures of impulsivity may be related to different components of the
