This study deals with the case alternation (accusative or dative) of the pronominal object clitic referring to the Experiencer of Spanish psychological verbs, such as alegrar ‘make happy’ and preocupar ‘worry’. We use data from the ADESSE database, which contains detailed semantic and syntactic information about a 1.5 million word corpus (ARTHUS), and allows us to identify all instances of psychological verbs with Experiencer objects and anticausative alternation. We selected 50 of these verbs from both Spanish and American texts. The statistical analysis of these data shows that the animacy of the Stimulus and Experiencer, gender, number, verbal aspect, and the general geographical area (Spain / America) are significant factors in the choice of the Experiencer case. As the corpus is relatively small, we searched for the same verbs, preceded by a 3rd person clitic pronoun, in the lemmatized and POS tagged CORPES (350 million words). The statistical analysis of these datasets confirms that both the specific verb and the geographical region are significant factors in the choice of the Experiencer case. Verbs and regions can be ranked from more to less dative preference, but the individual verbs turn out to behave in a homogeneous way, regardless of the region.