Question

specialized neuron in the visual cortex that responds only to particular features of visual stimuli
object recognition
edge detection
block diagram
input vector
feature detector

Explanation:

A feature detector is a specialized neuron in the visual cortex that responds only to particular features of visual stimuli. Object recognition is a broader process. Edge detection is a part of feature detection but more specific to edges. A block diagram is a graphical representation. An input vector is a set of input values.

Answer:

feature detector