Posts Tagged ‘ear’

Option E – Neurobiology and behaviour

Monday, January 9th, 2012

Mr Gray Eyes by Tim in sanhazzay on flickr

Here is the syllabus guide for this topic. Option E – syllabus guide

We’ll be using notes and resources from click4biology.  Also these two presentations from Mr Taylor.  E1 and E2.

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.

 

How we hear

Friday, March 26th, 2010
Malayan Flying Fox 2 by littleREDelf on flickr

Malayan Flying Fox 2 by littleREDelf on flickr

Sound waves travel through the air, and we are able to detect them, using our ears.  So, let’s start by looking at a diagram of the human ear, and relate the structure to the function.  You don’t need to be able to draw the diagram, just label it, and know what each part plays in allowing us to hear.  Use this site to learn about ear structure and how we hear. 

Now let’s try and answer these questions:-

  • Why do we have two ears?
  • What is perfect pitch?
  • How do cochlear implants work?
  • How is an owl’s face like a satellite dish?
  • What is ultrasound?  How do we use it?
  • What is echo-location?  Bats and dolphins use it all the time. Can humans learn to as well?

Thanks to Mr Boulton for finding these resources.

How we see, how we hear

Friday, February 12th, 2010
Eye see you! by dotbenjamin on flickr

Eye see you! by dotbenjamin on flickr

We’ll start by looking at the different kinds of receptors that humans have, then focus on the photoreceptors in the eye and mechanoreceptors in the ear.  Click4biology is useful, as is this presentation by Mr Taylor in Bandung.

You need to be able to label a diagram of the eye like this one: Eye diagram

We’ll also do an eye dissection so you can relate the diagram to “reality”.  We’ll compare the different types of photoreceptors that are on the retina, namely rods and cones.  We’ll explain contra-lateral processing (right brain processing information from left eye, and vice versa). And finally we will explain certain kinds of optical illusions by looking at edge enhancement.

We’ll label a diagram of the ear and explain how sound is perceived.  Here are some questions for consideration:-

Why do we have two ears?  What role does the pinna play in other animals? Can fish hear? What range of sounds can the human ear hear? What is a cochlear implant and how does it work?  What does it mean to be tone deaf or have perfect pitch?

How we hear

Tuesday, February 2nd, 2010
All ears by banlon1964 on flickr

All ears by banlon1964 on flickr

You need to be able to label a diagram of the human ear using the following labels:

  • pinna
  • eardrum
  • bones of middle ear
  • oval window
  • round window
  • semicircular canals
  • cochlea
  • auditory nerve
  • Eustachian tube

This animation explains how sound waves are detected by the ear and transmitted to the brain.

This site is useful in explaining how we hear.

Think about these questions – why do we have two ears?  What role does the pinna play in other animals? Can fish hear? What range of sounds can the human ear hear? What is a cochlear implant and how does it work?  What does it mean to be tone deaf or have perfect pitch?

Option E – Neurobiology and Behaviour

Tuesday, January 26th, 2010
Mr Gray Eyes by Tim in sanhazzay on flickr

Mr Gray Eyes by Tim in sanhazzay on flickr

Here is the syllabus guide for this topic. Option E – syllabus guide

We’ll be using notes and resources from click4biology.

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.  Use 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.  Here is a good presentation to help you get through all that!