Signals and perception: the science of the senses

What you will study

The module explores the ways in which exciting ideas and findings at the forefront of biochemistry, biophysics and molecular biology have transformed our understanding of how we experience the world through our senses. It provides an understanding of:

• the nature of the communication signals (e.g. light for vision, sound for hearing, molecules for taste and smell)
• primary transduction mechanisms that convert signals into electrical impulses
• the common nature of the transmission and processing of the resulting electrical signal within the nervous system
• sensory disorders and treatments.

The material is divided into six blocks, presented in three printed books, beginning with two blocks introducing the senses and the nervous system. These blocks are designed to give you sufficient neuroscience background to work through the remainder of the module and include online activities to maximise your understanding of this essential information. Blocks 3-6 also include online activities, as well as additional resources which can be accessed online.

Throughout the module the emphasis is on the commonalities and integration between the sensory systems, as you examine the processes from sensation to perception for each sense as well as the impact and treatment of impairment or loss of sensory systems.

Block 1 Introduction to the senses. This block introduces you to the human senses, concentrating on observations and experiences that raise questions about how the senses work.

Block 2 Introduction to the nervous system. In this introduction to neuroscience, and in particular to the neuron, you'll look at the way electrical impulses created by external signals of whatever kind are transmitted throughout the nervous system; and where they are processed and give rise to our personal picture of the world. You'll also explore the techniques that are commonly used in investigating the senses.

Block 3 Somatosensation describes the somatic sensory system including how we sense and perceive touch, pain and our own body position and movement. The latter is often considered a hidden sense and in this block you will explore the impact of its loss. You will also cover the multidisciplinary treatment of pain.

Block 4 Hearing and balance. In this block you'll explore the nature and properties of sound waves; the specialised anatomy and functioning of the ear; and how auditory perception arises, including for speech and music. This block also focuses on the vestibular system, which is housed within the ear, and how this system gives rise to our sense of balance.

Block 5 Vision. This block is exclusively dedicated to how we sense and perceive visual information. It is the longest block, in part because the most is known about vision but also because vision is in many ways the most complex of the senses. In this block you'll cover the nature and properties of light; the optical system of the eye; processing of visual information within the brain; and how we perceive different elements of the visual scene such as colour.

Block 6 The Chemical Senses. The related senses of smell and taste as well as the sense of flavour are the focus of this block. The topics covered include the molecular characteristics of substances that we smell or taste; the nature of the receptors involved; the coding of smell and taste and how smell may be used in diagnostics.

Entry

There are no formal entry requirements for this module.

At The Open University, we believe education should be open to all, so we provide high-quality university education to anyone who wishes to realise their ambitions and fulfil their potential.

Even though there are no entry requirements, you'll need appropriate study skills and knowledge obtained through:

• OU level 1 and 2 study
• equivalent work at another higher education institution.

Are you ready for SD329?

Preparatory work

We recommend you've completed:

• Brain, mind and mental health (SK298).

Study materials

What's included

Study books are provided in both printed and online format. In addition you'll have access to a module website, which includes:

• a week-by-week study planner
• course-specific module materials
• audio and video content
• assignment details and submission section
• online tutorial access.

Computing requirements

• Primary device – A desktop or laptop computer. It's possible to access some materials on a mobile phone, tablet or Chromebook; however, they will not be suitable as your primary device.
• Peripheral device – Headphones/earphones with a built-in microphone for online tutorials.
• Our OU Study app operates on supported versions of Android and iOS.
• Operating systems – Windows 11 or latest supported macOS. Microsoft will no longer support Windows 10 as of 14 October 2025.
• Internet access – Broadband or mobile connection.
• Browser – Google Chrome and Microsoft Edge are recommended. Mozilla Firefox and Safari may be suitable.

Teaching and assessment

Support from your tutor

Throughout your module studies, you'll get help and support from your assigned module tutor. They'll help you by:

• Marking your assignments (TMAs) and providing detailed feedback for you to improve.
• Guiding you to additional learning resources.
• Providing individual guidance, whether that's for general study skills or specific module content.
• Facilitating online discussions between your fellow students, in the dedicated module and tutor group forums.

Module tutors also run online tutorials throughout the module. Where possible, recordings of online tutorials will be made available to students. While these tutorials won't be compulsory for you to complete the module, you're strongly encouraged to take part.

Assessment

The assessment details for this module can be found in the facts box.

If you have a disability

The OU strives to make all aspects of study accessible to everyone. The Accessibility Statement below outlines what studying this module involves. You should use this information to inform your study preparations and any discussions with us about how we can meet your needs.