receptive field

Transduction

The process of converting a graded potential from a stimulus into an action potential.

Receptor

A structure that matches a specific stimulus; it must correspond to the type of stimulus (e.g., photoreceptor for light).

Nociceptor

A type of receptor that detects pain; it is the exception to the rule of matching stimuli.

Receptive Field

The area that is stimulated by a receptor; it receives and processes the stimulus.

Two-point discrimination

The ability to distinguish between two closely spaced points on the skin; varies by location on the body.

Proprioceptor

A receptor that detects body position and movement, but does not respond to pressure.

Thermoreceptor

A receptor that detects temperature changes.

Photoreceptor

A receptor that detects light.

Graded potential

A local change in membrane potential that can lead to an action potential if strong enough.

Sensory unit

A single nerve and all its fibers; it functions together to transmit sensory information.