Neglected children may experience delays in physical and psychosocial development, possibly resulting in psychopathology and impaired neuropsychological functions including executive function, attention, processing speed, language, memory and social skills. Researchers investigating maltreated children have repeatedly found that neglected children in the foster and adoptive populations manifest different emotional and behavioral reactions to regain lost or secure relationships and are frequently reported to have disorganized attachments and a need to control their environment. Such children are not likely to view caregivers as being a source of safety, and instead typically show an increase in aggressive and hyperactive behaviors which may disrupt healthy or secure attachment with their adopted parents. These children seem to have learned to adapt to an abusive and inconsistent caregiver by becoming cautiously self-reliant, and are often described as glib, manipulative and disingenuous in their interactions with others as they move through childhood. Children who are victims of neglect can have a more difficult time forming and maintaining relationships, such as romantic or friendship, later in life due to the lack of attachment they had in their earlier stages of life.