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1 Anatomy & Neurobiology, Washington UniversitySchool of Medicine, St. Louis, MO, USA
2 Psychology, California State University, Sacramento, CA, USA; Anatomy & Neurobiology, Washington UniversitySchool of Medicine, St. Louis, MO, USA
* To whom correspondence should be addressed. E-mail: larry{at}eye-hand.wustl.edu.
We present evidence that neurons in the lateral intraparietal area (LIP) of monkey posterior parietal cortex (PPC) are activated by the instruction to make an eye movement, even in the complete absence of a spatial target. This study employed a visually-guided motor task which dissociated the type of movement to make (saccade or reach) from the location to which the movement was to be made. Using this task, animals were instructed to prepare a specific type of movement prior to knowing the spatial location of the movement target. We found that 25% of the LIP neurons recorded in two animals were activated significantly more by the instruction to prepare a saccade than by the instruction to prepare a reach. This finding indicates that LIP is involved in more than merely spatial attention, and provides further evidence for non-spatial effector-specific signal processing in the dorsal stream.
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