Higher Mental Functions. Higher Mental Functions. The brain exhibits electrical activity, which is associated with higher mental functions. Brain Wave Patterns and the EEG. An electroencephalogram or EEG records brain activity.
The brain exhibits electrical activity, which is associated with higher mental functions.
An electroencephalogram or EEG records brain activity.
The patterns, known as brain waves, are like finger prints and are associated with various activities.
Alpha waves—awake but relaxed
Beta waves—awake, alert
Theta waves—common in children
Delta waves—deep sleep
(b) Brain waves shown in EEGs fall intofour general classes.
(a) Scalp electrodes are used to record brain waveactivity (EEG).
This are expressed as a frequency and is measured in hertz (Hz). 1 Hz corresponds to one peak per second.
EEG’s can be used to study brain activity.
Sleep is defined as a state of partial unconsciousness from which a person can be aroused by stimulation. This distinguishes it from a coma.
Two types of sleep are seen during the normal sleep cycle. They are associated with eye motion. They are:
Absence of sleep results in depression with some personality changes and difficultly in concentrating. Adults typically require 7 to 8 hours a night.
What about you?
Can lack of sleep kill you?
Although memory is the storage and retrieval of information, there appears to be no one area of the brain which carries out this function
Memory appears to occur in two phases, short term and long term memory.
STM is also known as working memory. The amount of information that can be stored for any one event is limited.
The amount of information that can be stored for any one event is limited.
For example, one can remember a telephone number but would not be able to remember an entire phone book page.
What is life like without a short term memory?
Long term memory is not limited. An entire page of a phone book would be stored here. Information can be forgotten.
Memorization vs Learning
General and special sensory receptors
old and new data
Information transfer from the STM to the LTM can be affected by the following factors:
Declarative memory involves learning facts or explicit information such as the muscles of the leg.
Non declarative (Procedural) memory involves less conscious learning such as a skill, playing the piano (procedural), riding a bike (motor) or emotional memory. These usually are not forgotten
The hippocampus is central in declarative memory while non declarative memory by passes this structure
Studies in animals reveal that learning involves the following changes in the brains:
So how does your memory work?