Psychophysics & a brief intro to the nervous system
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1 Psychophysics & a brief intro to the nervous system Jonathan Pillow Perception (PSY 345 / NEU 325) Princeton University, Fall 2017 Lec. 3
2 Outline for today: psychophysics Weber-Fechner Law Signal Detection Theory basic neuroscience overview
3 The Dawn of Psychophysics Gustav Fechner ( ) often considered founder of experimental psychology psychophysics mind matter scientific theory of the relationship between mind and matter
4 Fechner s law
5 The Dawn of Psychophysics Weber s Law Ernst Weber ( ) law about how stimulus intensity relates to detectability of stimulus changes As stimulus intensity increases, magnitude of change must increase proportionately to remain noticeable Example: 1 pound change in a 20 pound weight =.05 is just as detectable as 0.2 pound change in a 4 pound weight =.05
6 The Dawn of Psychophysics Weber Fraction ratio of change magnitude to stimulus magnitude that is required for detecting the change Ernst Weber ( ) change in stimulus stimulus intensity Q: what s the smallest change in a 100 pound weight could you detect? =.05 =.05
7 The Dawn of Psychophysics Weber Fraction ratio of change magnitude to stimulus magnitude that is required for detecting the change Just-Noticeable Difference (JND) smallest magnitude change that can be detected Ernst Weber ( ) Q: what s the smallest change in a 100 pound weight could you detect? =.05 =.05
8 Look at Fechner s law again:
9 A little math (don t freak out) Fechner s law: differentiate both sides percept intensity stimulus intensity Weber s law: change in stimulus intensity change in percept intensity So detectability ( how much the percept changes ) is determined by the ratio of stimulus change dr to stimulus intensity R. (so, it s really the same law!)
10 Weber-Fechner Law my rating: this is very deep / important!
11 Stevens Power Law
12 Stevens Power Law subjective based on rating data no right answer: just a mapping between one unknown scale ( pain ) and another unknown scale ( numbers ) (my rating: meh )
13 Test yourself: at which intensity are changes most detectable? A B C
14 For this stimulus/sensation relationship, which stimulus changes are most detectable? A B C
15 How to measure perception?
16 müller-lyer illusion
17 percept percept is internal
18 x f(x) blabla
19 Psychophysics detection (yes/no) discrimination (e.g., bigger than) estimation (report the stimulus exactly) All provide indirect measure of internal mental state!
20 Detection perfect threshold
21 Detection perfect threshold noise
22 psychometric function relates physical quantity to the probability of detecting it
23 Signal detection theory: A psychophysical theory that quantifies the response of an observer to the presentation of a signal in the presence of noise ( On board )
24 Figure 1.16 Detecting a stimulus using the signal detection theory (SDT) approach (Part 1)
25 Figure 1.16 Detecting a stimulus using the signal detection theory (SDT) approach (Part 2)
26 Figure 1.17 Sensitivity to a stimulus: The separation between the distributions of response to noise alone and to signal plus noise
27 Figure 1.18 For a fixed dʹ, all you can do is change the pattern of your errors by shifting the response criterion
28 Signal detection theory! Hit: Stimulus is presented and observer responds Yes! Miss: Stimulus is presented and observer responds No! False alarm: Stimulus is not presented and observer responds Yes! Correct rejection: Stimulus is not presented and observer responds No
29 Signal Detection Theory Terms to know: noise distribution: values arising when stimulus not present signal distribution: values arising when signal + noise present Type I error: rate of false alarms, or false positives Type II error: rate of misses, or false negatives psychometric function: describes probability of saying I heard it as function of stimulus intensity
30 Brief Neuroscience Intro:
31 the brain, yo
32 neuron axons of sensory receptor neurons dendrites of target neurons membrane is polarized: voltage difference between inside and outside (neuron is like a battery)
33 Spikes - currency of the nervous system channels open current flows in membrane becomes depolarized
34 spike propagation
35 synapse action potential triggers release of vesicles transmitter molecules bind to receptor post-synaptic electrical signal
36 measuring neural activity Invasive methods - electrophysiology (electrodes) - imaging (voltage sensitive dyes) non-invasive methods - fmri (functional magnetic resonance imaging) - EEG (electroencephalography) - MEG (magnetoencephalography)
37 You can safely ignore (for now) method of constant stimuli / method of adjustment ROC curves Fourier analysis (though we will come back to it!) Cranial nerves (Fig 1.20) brain anatomy (Fig 1.21, but we will come back as needed)
38 Summary Weber-Fechner law Stevens power law psychophysics psychometric function signal detection theory: threshold, criterion, Hit/ Miss, FA/CR, d (i.e., d-prime ) spikes, synapses, neurotransmitter
39 Next: Read Chapter 2
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