Final answer:
The receptive fields of simple neurons are rectangular because they are best suited to stimulation from a slit of light.
Step-by-step explanation:
The statement that receptive fields of simple neurons are rectangular because they are best suited to stimulation from a slit of light is True.
Receptive fields refer to the area of the sensory space in which a stimulus can produce a response in a sensory neuron. In the visual system, simple neurons in the primary visual cortex have receptive fields that are rectangular in shape. This is because the visual system is particularly sensitive to lines and edges, and a slit of light stimulates the receptive field of simple neurons in a way that maximizes their responsiveness.