Class Notes (834,568)
Canada (508,607)
Psychology (5,208)
PSYCH 2E03 (70)

introduction to vision.docx

5 Pages
Unlock Document

Gautam Ullal

September 26 , 2012 Psych 2E03: Sensory Processes Introduction to Vision Principle of brainstem auditory evoked response - far field responses (<25ms): brain stem auditory evoked response, 5 waves - near-field responses (>25ms): cortex later wave - anything wrong in the conduction pathway will affect near responses Brain-stem Auditory Evoked Responses - initial 2 waves: auditory nerve, far field - 3-5: brain stem, far field - 6: cortex, near field Typical Evoked responses to a meaningful stimulus - P1, P2, P3 etc. = 1 , 2 , 3 , etc. positive waves - N1, N2 = 1 2 negative waves - Note: the polarity may vary with reference to the electrode position. It is not important. Latency and amplitude of the peaks are important P300 a marker for Schizophrenia and Bipolar disorder - P300 latencies: patients>relatives>control, takes a longer time then it shouls, latency prolonged and amplitude are reduced - P300 amplitudes: contrl>relatives> patients - A similar trend has been even more consistently reported in schizophrenia literature N170, N250, P300-600 - shown picture of a face, no matter whose face it is you will see N170 - if face belongs to face you’re familiar with N170 and N250 - name of face, depending on how familiar you are P300-600, simpler more P300, complex P600, probably will also get the responses at N170 and N250 What type of ERp may seeing this conflicting/counter-intuitive picture evoke - N600, long latency, longer processing time - Depending on how long the latency is we are using more complex processes - Conflict: longer latency Skin conductance test - P300/N600 - Skin detection signal to test Functional MRI (fMRI)(MRI=Magnetic resonance imaging) - MRI detects levels of deoxyhemoglobin in the blood and bold images (blod- oxygen-level dependant images)
More Less

Related notes for PSYCH 2E03

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.