Loss of recognition of object by its feel seen with lesion of
## **Core Concept**
The question tests knowledge of the sensory pathway and its relation to object recognition by feel, also known as **stereognosis**. Stereognosis is the ability to perceive the form and nature of an object by the sense of touch, and it involves the integration of sensory information from the hands. The pathway for stereognosis involves the **dorsal column-medial lemniscus pathway** of the spinal cord, which relays sensory information to the brain.
## **Why the Correct Answer is Right**
The correct answer, , involves the **parietal lobe**, specifically the **posterior parietal cortex**. This region is crucial for processing sensory information related to touch and spatial awareness. Damage to this area can lead to **astereognosis**, which is the inability to identify objects by active touch with the hands without other sensory input. The posterior parietal cortex integrates sensory information from the hands, allowing for the recognition of objects by their texture, shape, and size.
## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because the **frontal lobe** is primarily involved in motor functions, decision-making, and certain aspects of cognition, but not directly in object recognition by touch.
* **Option B:** - This option is incorrect because the **temporal lobe** plays a key role in processing auditory information and is involved in memory and speech. While it does contribute to sensory processing, it is not primarily responsible for stereognosis.
* **Option D:** - This option is incorrect because the **occipital lobe** is primarily responsible for processing visual information. Although it does interact with other sensory pathways, it is not directly involved in recognizing objects by feel.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **astereognosis** is often associated with lesions in the **dominant parietal lobe**. Clinically, this can be tested by asking a patient to identify an object, such as a coin or a pen, using only their sense of touch, with their eyes closed. This is a valuable tool in neurological examinations to assess parietal lobe function.
## **Correct Answer: .**