Feedback Education and Neuroscience. Pankaj Sah

Transcription

1 Feedback Education and Neuroscience Pankaj Sah

2 Science of Learning Learning The process of acquiring a skill or knowledge that leads to a change in behaviour Memory The ability to retain and recover information from a previous experience Education Learning during which Skills/Knowledge/Ideas transferred from a teacher to student(s) Memory formation is an essential part of Education

3 Information/ skills Testing / Recall learning memory Storage 3

4 The feedback loop Teaching Testing 3 x 6 = 15 4 x 5 = 21 Feedback 4

5 What kind of feedback? Four general types recognised about the task processing the task self regulation person? What is the best way and how to decide? Why does it work?

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7 Theories of mental function Rene Descartes the original dualist 1632, It is a problem of the mind, not the brain - a physical object Mental function results from Neural Activity

8 Neuron Hypothesis 1906 Camillo Golgi Santiago Ramon y Cajal

9 About neurons billion Connected in networks - an electrochemical machine

10 About neurons in human brain Connections are synapses Each cell has up to 10,000 connections Total number of connections is immense!

11 Neural circuits are electrochemical machines A 5 ms 50 mv Presynaptic B Postsynaptic

12 Cellular theories of learning and memory formation Cajal Changes in connection strength The organisation of behaviour Hebbian Synapse

13 Hebbian Synapses A B A B Cells that fire together wire together

14 The case of H.M. Henry Molaison 1953 Age 60, 1986 Died 2008 age 82 At age 9 H.M. was knocked down while riding a bicycle Sustained brain injury that led to severe epilepsy 1953 (age 26) - operated on and inner surface of temporal lobe removed including the hippocampus After surgery relieved seizures but left with severe memory loss Unable to form new memories though retained past memories

15 Tim Bliss and Terje Lomo describe synaptic plasticity in the hippocampus Synaptic strength % This is long -term potentiation (LTP) Acquired rapidly Long lasting

16 Brain Function Activity Circuits Behaviour

17 Fear conditioning! Before conditioning After conditioning Defense behavior - freezing CS no response CS Autonomic changes HR/BP defecation Hypothalamic/pituitary

18 CS+ CS- Conditioned response measure acquisition extinction No extinction Trial # Day 1 Day 2 Day 3 or Day 30

19 Auditory thalamus LA Somatosensory thalamus Auditory cortex BA Somatosensory cortex CEA Effector targets

20 stimulus amygdala CS response US

21 stimulus amygdala response

22 stimulus amygdala response

23 Cellular model for fear conditioning: Hebbian plasticity in the amygdala LA neurons! before! after! CS! epsp! US! output! CS! Synaptic strength % Time Learning LTP - Long term potentiation

24 Learning / Memory Education Brain + + Systems Networks Neurons Synapses Science of Learning Pedagogy Biological understanding of learning Molecules Neuroscience

25 Reconsolidation Memory Formation Short term Memory Formation Short term Consolidation Long term Consolidation Recall?Long term Recall1 Reconsolidation Recall2 Memory Memory

26 The testing effect Study Study Study Recall Study Study Study Recall Test

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28 Partial reinforcement

29 unlearning?

30 Renew Reconsolidate Recall memor y -? Error Result