To observe aroused attention, you need to be in a position where you can see the action of the pupils of the person's eyes. The actions of the pupils of their eyes focus on the external information, followed by moving to the left or the right. In general, moving to the left indicates mental processing in the right hemisphere, where sensorimotor information is located, most of the time. Moving to the right indicates mental processing in the left hemisphere, where language information is located, most of the time. (Most information about human beings is correct "most of the time," which is usually about 80%, and I doubt that it ever gets as high as 90% with the brain. That means that nothing people do or say is ever 100% predictable, which raises havoc with your discharge recommendations and wishful thinking about confidence.)
Sensory impairments can impede the reception of information, especially visional and auditory information. There may be an association between lower levels of arousal and reductions in the quality of information processed that are not caused by etiologies in the visual and auditory systems. If so, replacing a person's glasses or hearing aid may not improve the effects caused by information processing. Access to information stored in the person's long-term memory is largely limited to the quality of information that arouses their attention. The exception is variously called habits, procedural memories or automatic actions. All of the labels refer to not fully conscious applications of methods for doing something that has been done so often that it requires less attention until something out of the ordinary happens.