About Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Types of Amnesia

Last Updated on Feb 19, 2020
Font : A-A+

Types of Amnesia

There are six different types of amnesia depending on the causes and the nature of disease progression.

Advertisement

a) Anterograde amnesia

Anterograde amnesia happens as a result of brain trauma that involves the hippocampus, fornix, or mammillary bodies.

Here the patient is unable to recollect events, that occur after the onset of the amnesia, for more than a few minutes. In other words, in these patients, recent events are not transferred to long-term memory. For example the patient is unable to recollect what his colleague’s name is or what he had for breakfast or which movie he saw the day before.

Although the person's intelligence, personality and judgment are intact he may have trouble in retaining his job because his day- to- day functional memory is poor. This can be devastating to the person and to his family. However, with the use of memory aids the affected person can, more or less, lead a useful life.

Advertisement

b) Retrograde amnesia

In this form of amnesia the affected individual will be unable to recollect events that occurred before the amnesia set in. The condition is caused either by disease or a brain injury especially in areas linked with episodic memory—the hippocampus and the median temporal lobes.

Memory is poorest regarding events that occurred just before amnesia set in. Early memories are comparatively safe with memory decline building up to the event. No cure has yet been found for this condition.

Types of Amnesia

c) Dissociative amnesia

Dissociative amnesia is a condition in which the patient is unable to remember vital personal information in a way that has nothing to do with normal forgetfulness. It is commonly seen in individuals who have witnessed a violent crime or a grave accident and does not occur due to a medical illness.

Advertisement

Patients with dissociative amnesia do not experience an identity crisis but they tend to pass through a trance-like state and may develop depersonalization as an effort to block out a stressful experience. Subtypes include –

  1. Generalized amnesia- When the amnesia involves the person’s whole life.
  2. Localized amnesia - no memory of a specific traumatic event that took place
  3. Selective amnesia- remembers only selective parts of events that occurred in a defined period of time.
  4. Systematized amnesia – memory loss regarding a specific category of information.

d) Infantile amnesia

The inability to recall events from early childhood is known as infantile amnesia. It is assumed that this happens due to immaturity in certain areas of the brain in the very early stages. Today, this state is seen as an intricate part of human development as it is now clear that memories begin to form only when certain parts of the brain are well formed.

e) Transient Global Amnesia (TGA)

In this type of amnesia there is temporary impairment in an otherwise healthy person's memory.

During this period of amnesia, the person is unable to recall recent occurrences, visuals or verbal information for more than a couple of minutes. Patients retain their identities, immediate recall abilities, distant memories, attention span, language function, visual-spatial and social skills.

However, they are often very confused by the ambience and the people around them. Although the period of memory loss does not usually last for more than a day the experience can be frightening! Some of the victims experience headache, dizziness, and nausea along with memory loss. Once recovered, the individuals are able to remember what occurred during the period of memory loss.

TGA generally affects fifty to eighty-year-old men. Its incidence is 3.4 to 5.2 people per 100,000 per year and the condition mostly affects 50-80 year olds.

Causes of TGA remain controversial. They include -

f) Wernike-Korsakoff's psychosis

This amnesia is a progressive disorder caused by extended alcohol abuse. It is usually accompanied by neurological dysfunctions such as loss of co-ordination during movement or a feeling of numbness in the fingers and toes.(2 Trusted Source
Amnesia - An Overview

Go to source
)

Reference:

  1. United states of amnesia: rescuing memory loss from diverse conditions - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5992608/)
  2. Amnesia - An Overview - (https://en.wikipedia.org/wiki/Amnesia#Types)
  3. What Causes Amnesia? - (https://www.goodtherapy.org/blog/psychpedia/amnesia)
  4. Amnesia / Memory Loss - (https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/amnesia)
  5. Amnesia - Health Library - (https://www.winchesterhospital.org/health-library/article?id=917219)

Citations   close

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Dr. Reeja Tharu. (2020, February 19). Types of Amnesia. Medindia. Retrieved on May 28, 2022 from https://www.medindia.net/patients/patientinfo/amnesia-types.htm.

  • MLA

    Dr. Reeja Tharu. "Types of Amnesia". Medindia. May 28, 2022. <https://www.medindia.net/patients/patientinfo/amnesia-types.htm>.

  • Chicago

    Dr. Reeja Tharu. "Types of Amnesia". Medindia. https://www.medindia.net/patients/patientinfo/amnesia-types.htm. (accessed May 28, 2022).

  • Harvard

    Dr. Reeja Tharu. 2021. Types of Amnesia. Medindia, viewed May 28, 2022, https://www.medindia.net/patients/patientinfo/amnesia-types.htm.


Do you wish to consult a Psychiatrist for your problem? Ask your question

Dr. Vishnupriya Veeraraghavan
Dr. Vishnupriya Veeraraghavan
MBBS, MD
6 years experience
Psychiatrist Dr.Vishnupriya, Christian Basti
Teleconsult Now View Profile
Dr. Archana Pofale-mohare
Dr. Archana Pofale-mohare
MBBS, DPM
7 years experience
Athshree Speciality Clinic, Tilak road, near cake studio
+ 1 more
Teleconsult Now View Profile
Dr. Padma S
Dr. Padma S
DPM
14 years experience
Teleconsult Now View Profile
Dr. Veera Bhadram
Dr. Veera Bhadram
MBBS, MD
10 years experience
Jb clinic, Sai castle
Teleconsult Now View Profile
View All

Post a Comment

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.

Comments

Samwilde

In the fall of 2009 I woke up in Cozumel with no memory of how I got there. I remembered planning the trip for our 30th wedding anniversary. However could not recall driving to the airport, the flight, layover, Etc... Needless to say My Wife was very concerned. After a while we assumed that the tequilla sunrise we may have been tainted [My Wife hardly touched hers]. Skip ahead to the summer of 2010. grand mal seizure upon awakening from a mid afternoon nap. Paramedics medevaced to Hospital. MRI, EEG, EKG, ETC... No abnormamities found. Since then. numerous nocturnal petit mal seizures. Doctors keep increasing dosage of Keppra. Early memories of childhood, adolescence, early adulthood appear to be intact. However, short term memory of people and places are vague to non-existent. I have been noticing a lot of chatter about bilirubin build up in brain. I want my memory back!

Advertisement
Health Topics A - Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z



    Advertisement
    What's New on Medindia
    Monkeypox Outbreak: What it is, How Does it Spread & the Prevention
    Seasonal Allergy Medications
    How to Choose the Best Eczema-Friendly Moisturizer for Children?
    View all
    Advertisement

    Medindia Newsletters Subscribe to our Free Newsletters!
    Terms & Conditions and Privacy Policy.

    Most Popular on Medindia

    Sinopril (2mg) (Lacidipine) Sanatogen Calculate Ideal Weight for Infants Nutam (400mg) (Piracetam) Blood Donation - Recipients Accident and Trauma Care Noscaphene (Noscapine) Drug - Food Interactions How to Reduce School Bag Weight - Simple Tips Hearing Loss Calculator

    Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

    © All Rights Reserved 1997 - 2022

    This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use