The cognitive sphere refers to the domain of human perception, beliefs, attitudes, and decision-making processes. In cybersecurity and information warfare, it is the psychological space targeted by disinformation, propaganda, and influence operations. Threat actors aim to manipulate individuals or groups by shaping opinions, spreading false narratives, or eroding trust in institutions. Attacks on the cognitive sphere can have significant impacts on public opinion, electoral outcomes, and social stability, making it a critical area of concern in modern cyber defense strategies.