Following extensive lesion of the neural structures adjacent to the third ventricle, eight thirst-motivated albino rats were trained on an alternative black-white brightness discrimination in a 3-choice-point straightaway. Acquisition performance (number of errors) of these animals was comparable to that of an equal number of operated controls. These and other data reported support the position that nuclei surrounding the third ventricle play no essential role in mediating the acquisition of a thirst-motivated brightness discrimination.
