## **Core Concept**
Pure word blindness, also known as alexia without agraphia, is a condition where a patient is unable to read despite having normal vision and writing abilities. This condition typically results from damage to specific areas of the brain involved in language processing.

## **Why the Correct Answer is Right**
The correct answer involves lesions in the **dominant occipital lobe** and the **splenium of the corpus callosum**. The occipital lobe is crucial for processing visual information, and the splenium is important for inter-hemispheric communication, particularly for transferring visual information from the right occipital lobe (which processes left visual field information) to the left hemisphere's language centers. Damage here disrupts the integration of visual information with language processing, leading to alexia.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Lesions in the **frontal lobe** are more commonly associated with motor speech difficulties (Broca's aphasia) and executive function impairments rather than pure word blindness.
- **Option B:** Damage to the **temporal lobe**, particularly on the left side, can lead to difficulties with auditory language comprehension (Wernicke's aphasia) but is not primarily associated with pure word blindness.
- **Option D:** Lesions in the **parietal lobe** can cause a variety of symptoms including spatial disorientation and difficulties with arithmetic and writing (geriatric or acalculia), but are not specifically linked to pure word blindness.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that pure word blindness often results from infarction in the territory of the **left posterior cerebral artery**, which supplies the occipital lobe and parts of the temporal lobe. This condition highlights the complex relationship between visual processing and language.

## **Correct Answer:** . occipital lobe and splenium of corpus callosum