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Patients with a left hemisphere stroke often exhibit cautious behaviors due to the impact the stroke has on the brain's functioning related to language, analytical thinking, and problem-solving. The left hemisphere is typically responsible for logical reasoning and detail-oriented tasks; thus, when a stroke occurs, patients may become more risk-averse and may approach activities with increased trepidation. This is a reflection of their altered cognition and perception, leading them to be more aware of potential risks and to proceed with caution in their movements and decision-making processes.

In contrast, impulsive behaviors are more commonly observed in patients with right hemisphere strokes, where deficits in judgment and insight may lead to risk-taking. Severe ataxia relates more to motor coordination issues and may not be as distinctly tied to left hemisphere strokes. Lastly, spatial deficits, often a result of right hemisphere damage, cause difficulties in perceiving and navigating space rather than being primarily associated with the left hemisphere. Thus, the cautious behavior observed in these patients is a direct consequence of their neurological changes following a left hemisphere stroke.