Mind and Body, Physiological Approach to Psychology

Edited by Jamie (ScienceAid Editor), Jen Moreau

Mind and Body

This page will examine how your physiology (anatomy) influences how you behave.

Nervous System

Below is a diagram of a neurone, these are the cells that make up nerves, they connect together and enable the body to control the muscles from the brain (or spinal chord in the case of a reflex).





The diagram shows a motor neurone, this sends electric impulses to the muscles. In a reflex, the impulse is received by a sensory neurone, for example you have touched something hot and then it goes to the central nervous system (brain and spine) where a relay neurone sends the impulse back down a motor neurone which puts the effector into action to cause a response. In this case the muscle in the arm contracts to pull it away from the heat source. And this all happens in a fraction of a second.

Was this helpful? Yes | No| I need help

The nervous system is divided into the Central Nervous System (CNS) which includes the spinal chord and brain and the Peripheral Nervous System (PNS) and part of this is the autonomic nervous system that controls the vital organs.

Was this helpful? Yes | No| I need help

There are two types of divisions within this. First is the sympathetic division that responds to an emergency and prepares for fight or flight. And then there is the parasympathetic division that relaxes the organs and builds energy reserves.

Was this helpful? Yes | No| I need help
Fight or Flight

The 'fight or flight' response refers to how the body responds to an emergency situation by either running away (flight) or standing up to it (fight). The type of situation the body has evolved this to deal with is if a predator was running towards you. However, it is brought into any stressful situation, even if it isn't life threatening: like before an exam for example.

Was this helpful? Yes | No| I need help

In this response the sympathetic division of the nervous system is stimulated so that the heart beats faster to allow more oxygen to get to the muscles so that they can work more.

Working alongside the nervous system is the hormonal system; chiefly adrenaline which is secreted from the adrenal gland (above the kidney) and maintains a faster heart rate, deeper and faster breathing and breaking down storage into sugar for the muscles to use.

Was this helpful? Yes | No| I need help
The Brain

As you know it is the brain that is responsible for our intelligence, thoughts and controlling the body, so not surprisingly, it is the brain more than any other part of your physiology that is of most interest to Psychologists.

Was this helpful? Yes | No| I need help

In examining the brain, we often use the principle of localisation of cortical function which is the idea that particular regions of the cortex (outside) of the brain are responsible for specific functions.

Was this helpful? Yes | No| I need help

Research started into this area with Penfield who looked at soldiers with shrapnel injuries (bits of metal) in the brain, he noticed that visual problems were caused by damage to similar areas of the brain.

Was this helpful? Yes | No| I need help

Other methods of investigating the brain are outlined in the table below.


Method What is done Advantages Disadvantages
Neurosurgery Parts of the brain are removed, or links are destroyed. Precise locations can be identified.

Behaviour before and after can be compared.

Is only performed on people who already have serious illnesses as a last resort.

Part removed may only be part of a chain.

EEGs Probes are put on the surface of the head to measure brain activity. Non-invasive and can be done on anyone. Only measures activity so gives no idea about structure or function.

Electrodes take average measurement over broad area.

Electrical Stimulation Microelectrodes are used to stimulate nerves in the exposed brain while patient is conscious. i.e. the skull is removed then patient is woke up (with head numbed) with brain exposed and clamped. It is very precise.

The patient can carry out tasks during the stimulation. Less harmful than neurosurgery and isn't permanent.

It is invasive.

Only can be done on people very ill and animals (so generalising to all humans is not possible). Because of the nature of nerves, the stimulation may well spread to other areas.

Scans (PET, MRI) PET uses radioactive sugar to show up active areas of the brain in a scan.

MRI uses magnetic fields to produce a 3D image of the brain.

Non-invasive

Detailed structure of the brain (MRI) and live information about brain activity (PET).

Only information about the structure.

Has poor ecological validity because participant has to keep their help still inside a scanner.



Further evidence for localisation of cortical function comes from Peterson et al who used PET whilst participants either listened to, thought about or read nouns; it showed that for each of these tasks, specific different areas of the brain were being used.

Was this helpful? Yes | No| I need help

However, through continued research and ever improving methods, neuroscientists are now coming to the conclusion that perhaps the cortex isn't divided into areas with specific functions after all.

More and more the idea of brain plasticity is being accepted which says that if damaged, other parts of the brain will take over the functions of the bit damaged. Evidence for this holistic view of the brain comes from Lashley, who removed bits of the brain cortex in rats, and found that it wasn't where the tissue was removed that was more important but how much.

Was this helpful? Yes | No| I need help

Referencing this Article

If you need to reference this article in your work, you can copy-paste the following depending on your required format:

APA (American Psychological Association)
Mind and Body, Physiological Approach to Psychology. (2017). In ScienceAid. Retrieved May 23, 2018, from https://scienceaid.net/psychology/approaches/physiological.html

MLA (Modern Language Association) "Mind and Body, Physiological Approach to Psychology." ScienceAid, scienceaid.net/psychology/approaches/physiological.html Accessed 23 May 2018.

Chicago / Turabian ScienceAid.net. "Mind and Body, Physiological Approach to Psychology." Accessed May 23, 2018. https://scienceaid.net/psychology/approaches/physiological.html.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.

Comments

ScienceAid welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

Article Info

Categories : Approaches

Recent edits by: Jamie (ScienceAid Editor)

Share this Article:

Thanks to all authors for creating a page that has been read 85 times.

x

Thank Our Volunteer Authors.

Would you like to give back to the community by fixing a spelling mistake? Yes | No