4. Sensing: Gathering the Information (audio only)

TL;DR

This lecture explores how we see and how our visual system processes and interprets information from the outside world.

Transcript

The following content is provided by MIT OpenCourseWare under a Creative Commons license. Additional information about our license and MIT OpenCourseWare in general is available at ocw.mit.edu. JEREMY WOLFE: What I'm going to do for the next three lectures is to talk about how we see. What I'm going to do today is talk about how we take information... Read More

Key Insights

• 😃 The visual system is complex and involves multi-step processes from the eye to the brain.
• 💁 Perception is not a direct registration of the outside world but involves the interpretation of information.

Questions & Answers

Q: What is the purpose of the cornea in the eye?

The cornea is the front surface of the eye and acts as a lens that focuses light onto the back surface of the eye, allowing us to see images.

Q: What is the purpose of the pupil and why does it change size?

The pupil is the aperture of the eye and the size changes to control the amount of light entering the eye. More light makes the pupil constrict, allowing less light in, while less light makes the pupil dilate, allowing more light in.

Q: What does the retina do in the visual system?

The retina is the tissue at the back of the eye that transduces light energy into signals in the nervous system. It has different types of cells, including photoreceptors that convert light into signals, and ganglion cells that send signals to the brain.

Q: How does the visual system interpret the orientation of objects?

The visual system uses a comparison of activation in cells that respond to different orientations to determine the orientation of objects. It relies on the balance of activation between cells that respond to different orientations to make this determination.

Summary & Key Takeaways

• The lecturer discusses how our visual system takes in information from the outside world and selects relevant information from the overwhelming amount available.

• Perception is not a direct registration of the outside world, but rather an act of interpretation.

• The eye plays a crucial role in forming an image on the back of the eye, and the retina transduces light energy into signals in the nervous system.