Final answer:
The subdivisions of loss of divergent thinking in the frontal lobe include praxis (motor response to verbal commands) and gnosis (recognition of sensory information), which can be affected by V impairment (verbs) or N impairment (nouns), depending on the damaged brain region.
Step-by-step explanation:
The two subdivisions of loss of divergent thinking in the frontal lobe related to the prefrontal cortex are primarily concerned with praxis and gnosis. Praxis refers to the ability to carry out motor activities in response to verbal commands, which heavily relies on language processing and can be affected by damage to language functions or aphasias. Conversely, gnosis is related to the perception and recognition of sensory information, which can also be coupled with language components—specific deficits in comprehending words used to describe actions (verbs) or objects (nouns). These impairments are known as V impairment (verbs) and N impairment (nouns), or V-N dissociation, where the patient has difficulty in using one type of word over the other. Damage to particular areas such as the insula is associated with V impairment, while damage to the middle and inferior temporal lobe is linked to N impairment.