The brain areas related to this system are the posterior parietal cortex, the lateral pulvinar nucleus of the thalamus, and the superior colliculus. Posterior Attentional System (PAS) or Orientation System: This system is in charge of Focused Attention and Selective Attention of visual stimuli.It is closely related to the reticular formation and some of its connections, like the frontal areas, limbic systems, the thalamus, and the basal ganglia. Reticular Activating System (RAS) or Alert System: This system is mainly in charge of Arousal and Sustained Attention.Divided Attention: The ability to attend different stimuli or attention at the same time.Īccording to the neuroanatomical model from Posner and Petersen (1990), there are three different attentional systems.Alternating Attention: The ability to change focus attention between two or more stimuli.Selective Attention: The ability to attend to a specific stimulus or activity in the presence of other distracting stimuli.Sustained Attention: The ability to attend to a stimulus or activity over a long period of time.Focused Attention: Refers to our ability to focus attention on a stimulus.Arousal: Refers to our activation level and level of alertness, whether we are tired or energized.According to this model, attention can be divided into the following parts: The most accepted model for the attention sub-components is currently the hierarchical model from Sohlberg and Mateer (1987, 1989), which is based on clinical cases of experimental neuropsychology. Over time, scientists and researchers have found out that attention is not a single process, but rather a group of attention sub-processes. Attention is a complex process that we use in almost all of our daily activities.
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