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Lecture 7 Electrophysiological techniques

Assignment:Read text: pp. 586-589 (EEG major concepts)

Box 7.3 on pp. 178-179 (PE scans! "#R$)

Remem%er: Essa& 1 d'e on ed! ept. 9 Exam 1 on ednesda&! ept. 16

Recommend: Re*+e, ect're notes

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,o strate+es "or +ncreas+n t/e speed o" act+on potent+a

propaat+on /a*e e*o*ed:

1.) +ant axons (+n*erte%rate strate&)

- axons ,+t/ are d+ameter /a*e ess eectr+ca res+stance

- present +n s0'+d! cra&"+s/! and ot/er +n*erte%rates

- cont+n'o's (stead&) mo*ement o" P! %'t "aster

2.) m&e+nat+on and satator& cond'ct+on (*erte%rate strate&)

- ser+es o" d+scont+n'o's Ps one at eac/ node o" Ran*+er

- P 4s+ps do,n t/e axon

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#&e+n s/eat/s are prod'ced %& +a ces

(man& t&pes ex+st)

Schwann cells +n per+p/era ner*es

Oligodendrocytes+n t/e

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ont+n'o's cond'ct+on

(t&p+ca o" +n*erte%rates)

atator& cond'ct+on

(t&p+ca o" *erte%rates)

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+*e met/ods o" eectrop/&s+oo& "or mon+tor+n ne'rona act+*+t&: E: /+s +s not a compete +st t/ere are ot/ers;

1.) +ntrace'ar record+n

2.) extrace'ar record+n ,+t/ /oo eectrodes

3.) extrace'ar record+n ,+t/ m+croeectrodes

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text%oo act+on potent+a mon+tored ,+t/

+ntrace'ar record+n

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Five methods of electrophysiology for monitoringneuronal activity

1.) +ntrace'ar record+n

2.) extrace'ar record+n ,+t/ /oo eectrodes

3.) extrace'ar record+n ,+t/ m+croeectrodes

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Extrace'ar record+n ,+t/ /oo eectrodes

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#an& axons are conta+ned ,+t/+n a s+ne ner*e.

$n t/+s +mae "rom t/e 4Bra+n%o, project! d+""erent axons

,+t/+n a ner*e are d+""erent coors.

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Extrace'ar record+ns "rom ner*es +n t/e stomatoastr+c an+on o" cra%s

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Five methods of electrophysiology for monitoringneuronal activity

1.) +ntrace'ar record+n

2.) extrace'ar record+n ,+t/ /oo eectrodes

3.) extrace'ar record+n ,+t/ m+croeectrodes

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Extrace'ar record+n

,+t/ a m+croeectrode

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Five methods of electrophysiology for monitoringneuronal activity

1.) +ntrace'ar record+n

2.) extrace'ar record+n ,+t/ /oo eectrodes

3.) extrace'ar record+n ,+t/ m+croeectrodes

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Eectroencep/aorap/& -eectrodes on scap

-mon+tors s'm eectr+ca act+*+t& o"

m++ons o" ne'rons

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Five methods of electrophysiology for monitoringneuronal activity

1.) +ntrace'ar record+n

2.) extrace'ar record+n ,+t/ /oo eectrodes

3.) extrace'ar record+n ,+t/ m+croeectrodes

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#anetoencep/aorap/& (#EG)

(mon+tor+n %ra+n act+*+t& %& mon+tor+n ,ea manet+c "+eds prod'ced %& %ra+n)

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$n"ormat+on "rom #EG +nc'des ,/at %ra+n areas are act+*e and ,/en.

so: %etter t/an EEG at oca+@+n so'rces o" ne'ra act+*+t& deep ,+t/+n t/e %ra+n.