Final answer:
Characteristics of left parietal lesions include aphasia, difficulties with spatial cognition, and sensory deficits such as impaired double simultaneous stimulation, stereognosis, and graphesthesia due to the role of the left parietal lobe in language and cognitive functions.
Step-by-step explanation:
Characteristics of left parietal lesions may include a variety of sensory and cognitive deficits. Based on knowledge of parietal lobe functions, a left parietal lesion might result in difficulties with understanding language and performing tasks that require spatial cognition and perception. For example, individuals with damage in this region may experience aphasia, which is a loss of speech function, issues with praxis (the ability to perform purposeful movements), and gnosis (recognition or knowledge), particularly affecting multimodal integration and language-dependent processing. Impaired double simultaneous stimulation, where one side of the body is not perceived, might also indicate left parietal damage. Additionally, such a lesion could impact the ability to perform tasks like stereognosis (identifying objects through touch) and graphesthesia (recognizing writing on the skin purely by the sensation of touch).