Describe the receptive fields of neurons in the visual system - from retina through to cortex. How do these receptive fields change and what is the significance of these changes? (Hint: what sorts of information are extracted from fields at each level? How is this done?

Figures and graphs: not required, but you may add these in additionalpage(s); must refer to these figures in your text.

Structure: carefully plan the sequence of topics -- do not jump back-and-forth between them. Minimize broad, general statements. Don't stray too far from the central issue -- essay needs relevant, precise facts and details.

Proof-read: review the essay carefully before submitting it; check for spelling, repetitious statements and contradictions.