Yes, in cases of dissociative disorders like Dissociative Identity Disorder (DID) and Otherwise Specified Dissociative Disorder (OSDD), it is possible for an alter personality (also known as an alter or identity state) to be aware of the existence of other alter personalities within the same person. This phenomenon is referred to as "co-consciousness."
Co-consciousness occurs when two or more alter personalities are aware of each other's existence and experiences. This awareness can vary in strength and clarity. In some cases, alters may have limited awareness of others, while in other instances, they may have more detailed knowledge of each other's thoughts and actions.
The level of co-consciousness can change over time and may be influenced by various factors, such as therapy, internal cooperation, and safety within the individual's internal system. Co-consciousness can be beneficial as it allows for increased communication and cooperation among alters, promoting a more functional and cohesive internal system.
It's important to note that the experiences of individuals with dissociative disorders are highly individual and can differ significantly from one person to another. Co-consciousness is just one aspect of the complex and varied nature of dissociative disorders. Working with a qualified mental health professional experienced in treating dissociative disorders can help individuals explore and understand their unique experiences and internal system better.