2. Neuroanatomy

TL;DR

The cortex is organized into distinct areas with specific functions, such as visual area MT, which is involved in processing motion.

Transcript

NANCY KANWISHER: So seeing where animals are going, so you can avoid them if they're coming after you or so you can catch them if you're going after them, right? One of the arguably uniquely human abilities is precision throwing, right? No other animal can do that. That's a very human thing. Although, visual motion is shared with lots of ability to... Read More

Key Insights

• ❓ Visual area MT is a distinct cortical area involved in processing motion.
• ❓ Neurons in visual area MT are direction-selective, responding to specific directions of motion.
• ❓ Visual area MT has a unique connectivity fingerprint, indicating its distinct role in the visual processing network.

Questions & Answers

Q: What is the primary function of visual area MT?

Visual area MT is involved in processing motion, specifically, neurons in this area are direction-selective, responding to specific directions of motion.

Q: How is the distinct function of visual area MT established?

Studies using recording techniques in monkey brains, as well as functional MRI scans in humans, have shown that visual area MT is specifically involved in motion processing.

Q: What evidence suggests that visual area MT is a distinct cortical area?

Visual area MT has a unique connectivity fingerprint, with connections to other visual regions in the brain that are different from neighboring regions. Additionally, histological analyses have revealed physical differences in area MT compared to other areas.

Q: How does a patient with brain damage in visual area MT experience visual perception?

Patients with damage in visual area MT may exhibit akinetopsia, a condition where they have difficulty seeing or perceiving motion. This can lead to challenges in tasks such as crossing streets or catching objects.

Summary & Key Takeaways

• Visual area MT, located in the cortex, is involved in processing motion.

• Neurons in visual area MT are direction-selective, responding to specific directions of motion.

• The region has a distinct connectivity fingerprint, with connections to other visual regions in the brain.

• Area MT exhibits specific histological differences, making it physically distinct from neighboring regions.