In each session the total number of licks, the mean lick cluster size, and the amount consumed were recorded. Amount consumed was measured by weighing the sipper tube before and after each period of access. Lick clusters were defined as two or more licks made with less than 0.5 s between the end of one lick and the start of the next. Once the inter-lick interval was 0.5 s or longer, the lick cluster was deemed to have ended. The mean lick cluster size was calculated by dividing the total number of licks that were made within clusters of licks by the number of completed lick clusters. If a mouse was midway through a lick cluster when the tube was retracted at the end of the period of access to the sipper tube the licks were added to the total number of licks made within lick clusters, but no completed cluster was counted. Therefore, this method potentially over estimates lick cluster size to a small degree.

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