**Core Concept**
Deja vu is a common psychological phenomenon characterized by a feeling of familiarity or recognition of a situation or event that has occurred before, even if it has not. This experience is often described as a sense of familiarity or a feeling of having lived through the moment before. The exact mechanisms behind deja vu are not fully understood, but it is believed to be related to abnormalities in brain function, particularly in regions involved in memory and perception.

**Why the Correct Answer is Right**
Deja vu is often associated with temporal lobe abnormalities, including seizures and lesions. It is thought to result from misfiring or abnormal electrical activity in the hippocampus, a structure critical for forming and storing new memories. Studies have shown that individuals with a history of temporal lobe epilepsy or other neurological disorders are more likely to experience deja vu. Additionally, brain regions involved in attention and perception, such as the prefrontal cortex and parietal lobes, may also contribute to the phenomenon.

**Why Each Wrong Option is Incorrect**
**Option A:** Frontal lobe lesions are more commonly associated with changes in personality, mood, and cognitive function, rather than deja vu.
**Option B:** Cerebellar ataxia refers to a loss of coordination and balance, which is unrelated to the experience of deja vu.
**Option C:** Sensory deprivation can cause a range of perceptual distortions, but it is not a direct cause of deja vu.

**Clinical Pearl / High-Yield Fact**
Deja vu is a common experience that affects up to 70% of the general population at some point in their lives. It is often benign and does not require treatment, but in some cases, it can be a symptom of an underlying neurological disorder.

**Correct Answer: C. Cerebellar ataxia.**