Two cognitive and neural systems for endogenous and exogenous spatial attention

  title={Two cognitive and neural systems for endogenous and exogenous spatial attention},
  author={Ana B. Chica and Paolo Bartolomeo and Juan Lupi{\'a}{\~n}ez},
  journal={Behavioural Brain Research},

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  • M. Posner, Y. Cohen, R. Rafal
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In cases of mid-brain degeneration due to progressive supranuclear palsy, saccadic movements were abolished, while covertorienting still occurs, however, covert orienting was found to be delayed in directions in which eye movements were most affected, suggesting a role for mid- brain pathways in covert Orienting.