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    • Valdés, José Luis; Sánchez, Cristián; Riveros, María Eugenia; Blandina, Patrizio; Contreras, Marco; Farías, Paula; Torrealba, Fernando (Blackwell Publishing Ltd, 2010)
      Obtaining food, shelter or water, or finding a mating partner are examples of motivated behaviors, which are essential to preserve the species. The full expression of such behaviors requires a high but optimal arousal ...