Perception To Action Flashcards
What are cortical columns
Vertical subsections of cortical surface made of specialised modules
Function in processing of specialised perceptual, cognitive or motor aspects
How are all orientations covered across cortex
100 Mini columns are needed for full representation
Every 50um the orientation preference of the cells change to cover all orientations
Properties of info processing across cortex
Info is passed in modules of highly interconnected neurons across the depth of the cortex that process similar info from column to column
In every relay of info it is transformed
New info takes shape every time info flows from one module to the next to next
Sin fire chain
When cortical column becomes active all neurons simultaneously fire usually in a particular pattern
Neurons integrate together and output new interpretation of info
Sensory vs association areas
Sensory- only code for stimulus while it’s present (make decision)
Association- code for stimulus while present and in memory and also comparison between stimuli then transform info into a decision (leads to movement )
Positive vs negative monotonic coding
Negative- higher the vibration frequency the lower the firing rate
Positive- high vibration = higher firing rate
What is categorical coding (monkey task)
Responses from two supplementary motor area neurons : when neuron fires a choice is made
1. One neuron fired when trial is short
2. One fires if answer is incorrect
What is population vector
When more than one orientation (+/-10) is coded for by particular frequency - neurons individually fire with a specific orientation and average of all neurons decides what way you move
Motor and visual areas
Multiplexing
Multitasking of neurons
One neuron coding info from F1,F2 and making a decision
Communication
Everything that conveys a message (93% is non verbal)
Communication sensors detect implications, irony mood etc
Language
Verbal message and some paraverdal components
Mixed theory of language
Explains dominance if left hemisphere in verbal and sigh language
Both gesture and vocal factors developed
Mirror neurons
Finalised actions with biological effector
-perception of action
-internal representation
-neural basis of comprehension of other peoples actions
Difference in human mirror systems
More sophisticated-
Activates with somatotopic distribution
Activates in response to mimic of action
Basic function- comprehension of other peoples motor actions by motor actions already known to subject
Brocas vs wernikes
Broca - production of language
Wernike - comprehension of language
