Single-Neuron Feature Detectors Area V1 contains neurons that respond to specific orientations of edges. Here a single neuron’s responses are recorded (left) as the monkey views bars at different orientations (right). This neuron fires continuously when the bar is pointing to the right at 45°, less often when it is vertical, and not at all when it is pointing to the left at 45°.
FRITZ GORO/TIME & LIFE PICTURES/GETTY IMAGES