 That said, there are many forms of consciousness that we will not discuss. Some are covered in other entries such as split brain phenomena (see the entry on  the unity of consciousness,  section 4.1.1), animal consciousness (see the entry on  animal consciousness), and neural correlates of the will and agency (see the entry on   agency,  section 5). In addition, this entry will not discuss the neuroscience of consciousness in audition, olfaction or gustation; disturbed consciousness in mental disorders such as schizophrenia; conscious aspects of pleasure, pain and the emotions; the phenomenology of thought; the neural basis of dreams; and modulations of consciousness during sleep and anesthesia among other issues. These are important topics, and the principles and approaches highlighted in this discussion will apply to many of these domains.