Here is the syllabus guide for this topic. Option E – syllabus guide
The first section is all about stimulus and response, so we’ll recap a bit of the nervous system, particularly the stuff on reflex arcs. We’ll then move on to explain how animal responses can be affected by natural selection. You need to investigate two examples of this. You can use the blackcap bird (Sylvia atricapilla) as one, and any other of your choosing.
Moving on to perception of stimuli, we’ll study both the eye and the ear. You need to be able to label a diagram like this one: Eye diagram We’ll then do a dissection so you can identify the parts properly.
You will also have to:
- annotate a diagram of the retina to show cell types and direction of light movement
- compare rods and cones
- explain the processing of visual stimuli (edge enhancement and contralateral processing)
We’ll then move on to the ear, and you will need to be able to label a diagram and explain how sound is perceived.