P3 responses in persons with mental disorders

106P

Society Proceedinp

facilitate

general assessment of the type of hearing disorder,

non-cooperating

individuals.

out any demonstrable Preschool

A group of children

cerebral

and school-age

lesion

or hearing

children

were

children.

used as stimulation

the contralateral

noise. The click intensity

children,

normal

The aim was to find the absolute inter-peak

rate the assumption interpeak

latencieo

latencies), slight

while

I-III,

the click

III-V

30

dB

of interpeak

level

latencies

variations in the healthy Coupek and 2. Hotova (Bmo)

Variations

in the

were

between

7 am.

values

studied

of

and 7 p.m.

measurements

were

model (ANOVA).

that of absolute

some

the older age groups, a

was found,

prolongation

auditory

subjects

for the latency

significant

I-III,

I-IV

and I-V.

proportional

of

Apart

a concrete

found at 7 a.m., the shortest

of the means of 95% confidence

An inversely

and

difference

with

of wave 111were 0.04 msec, a negligible

practice.

were: (a)

of dispersion,

interactions

the longest latencies

ones at 4 p.m. The differences

of sensory

tracts,

intervals

value in terms of

amplitude-latency

dependence

response recorded

and

activity

(2)

stationary

action

Melchova

for tumour,

and BAEP

evaluation.

auditory

evoked

system and its knowledge Six

inputs

different

were

- J. Kraus

intensity

consisted

of

respectively.

latency During

After

the learning

the latencies

and S.

obtained

period, 486DX

incomplete

input

period system.

was much

Using the testing

in abnormality

testing.

be added to the existing 45 dB

stimulation,

system

was

characteristics

able

concerned.

Inconsistent

with

training

a loss of to consider

were included

algorithm

of the neuronal learning

In borderline

an

process

cases, the

by the expert

rate of 94% was achieved data have to

data set. In cases of missing response to unknown

in the memory

was diagnosed. inputs

and

Hence,

Disordered

peripheral

outputs,

and

nism

of myasthenia

reported fluid

of late with

patients),

(ACR),

from

from

the

in J.

Cognitive

healthy

(BAEPs)

sex-

Abnormal

with

found

and

BAEPs

and auditory

age-matched

were found

in

were prolonged

interval

I-III,

controls

and controls,

however,

tion of P300 latency III

(358

dysfunction, specificity

likewise.

two

and late start of in the MC group

was significantly

significantly

reduced

higher (P < 0.01) in MC prolonga-

The average P300 latency

in group

IIb

(323

msec,

as a purely

to have latency

in the more seriously in connection

affected

with

was longer

P < 0.05).

peripheral

In

involve-

abnormities

the presence of brain-stem

in MC is under further

each in

abnormalities

III-V.

was found

suggesting

of such findings

gic dysfunction

interval

idea of MC

of patients

patticularly

examined

comprising

group. AERPs revealed an abnormal

msec) than

potentials

(AERPs).

was not different

111 amplitude

in 3 patients.

to the conventional

ment, our group

were

auditory

potentials

The most frequent

prolonged

wave

stages Ila (5

brain-stem

event-related

I amplitude

wave 1. The average wave

in the cerebrospinal

using

10 patients,

mecha-

have also been

MCI in Ossermann’s

groups IIa and Ilb, and six in group III.

evoked

disorders,

against ACR

21 patients

due to an autoim-

is the underlying

IIb (XI and 111 (8) were examined

evoked potentials 25

(MC).

antibodies

of MG patients.

transmission,

receptors

gravis

34. P3

of

and subcortical MC patients. The

possible

central

choliner-

scrutiny.

in persons

responses

with

mental

disorders.

-

K. BareS

(Prague) Retrospective mentally

the parameters.

types: (I) records, posterior

typical,

with

exhibiting

itself

diseases.

records

the P3 wave higher latency

5 recordings

from I-3

eye artifacts

frontal

responses (6)

appear to be physiological

in the

lower than P2 in lesion; (4)

(5 persons),

no response

variants

pictures of an organic

often

at all (8

of the response, lesion.

brain (a case report). - L. Hafik (Prague)

The cases are presented brain, yet minimal

into 6

of the potential

pictures of an organic

(8 persons);

can be seen as potential

35. The redundant

were done,

maximum

distribution

(3 persons); (3) P3 voltage at the maximum (5) solely

52

than the P2 in at least two

and symmetrical

(9 persons) and 3 potential

of

with the aim of rating

The results of the P3 tests were divided

a normal

P3 retarded (5 persons);

The degree of detail present in the

in mental

the clinical

controls

quadrants (13 persons); (2) atypical

(not frontal)

types 4-6

was made of

persons and 5 healthy

the type of P3 responses changing

hard to tell

of the generator

assessment

disordered

the

base.

response is a function

and intradurally

are shown in patients treated neurosurgi-

neuromuscular

mune lesion of acetylcholine

persons). Types

of the electrode.

of responses recorded

correlate of central dysfunction gravis? - E. RuiRka, R. Jech, N. SpaEkova, L. Simkova and J. Tichy (Prague)

its maximum

evoked responses during signal transmission from the skin surface through dorsal roots to dorsal columns. - I. StetkaiovP and L. Stejskal (Prague)

The record of an evoked

and

postsynaptic

cyst or spondylosis.

the

32. Somatosensory

and a characteristic

of

data sets

even in cases with

the system, new learning

recruitment

indicative

space

roots

a co-processor.

data were rejected

data set, a reliability

To improve

was char-

100 measurements

data set. The time of the abnormality longer.

topology

mechanism

abnormalities

depends on the type of abnormality

software. and V of

a back-propagation 40 MHz

of

expert

I, III

and testing

68 and

the interference

system was able to diagnose

neuronal

using EXPSYS

network

from

PC computer

the evaluation

The

The training

the learning period,

for

of waves

The neuronal

of 6-9-9-9.

values

was used on an IBM expert

for

stimulation.

by the system

system (BAEPs).

base were developed

designed

acterized

expert

potentials

or epidural

33. Is there an electrophysiological

in group

The authors used a neuronal

subpopu-

The responses

in the spinal

space, extradurally

dorsal roots and dorsal columns

contrast

brain-stem

potentials

and roots

in a distinct

potentials

in the spinal gray matter. Examples epidural

the dorsal

in the dorsal columns

the skin surface

action

a

in detail

from

velocity.

into

cord with

diminishing

recordings

condution

cord from

propagating

patients than in the control

network (Prague)

elecPNP-

changes

in the spinal

conduction

of different

along the spinal of: (I)

surface

fibres,

extradural

(P < 0.01) and wave V amplitude

was found for waves I, III and V.

31. Neuronal

the skin

in the dorsal column

tibres

the skin surface,

day

analysis

values of the latencies

I-II,

second-rate

I

of 246

a dispersion

component

from

and, especially,

roots. The polyphasic

recorded

on the recording

the greatest definition

consists of small sharp peaks reflecting

consisted

mainly

potentials

features of dispersion

waves II, 111, IV and V, and in intervals subject were expressive,

P.

recorded with

inserted

intradural

tally

of

days. The results

and afternoon

only

evoked

in the course

using

(b) unexplained

latency,

age group.

- J. LntnEka,

on the time of day. A statistically

from the wave III

the electrode with

response depends

potential potential

myasthenia Klinderova,

statistically

the morning

is

by 0.1 or so in the

population.

The most conspicuous

was found between

the level of

where

for 5 successive

assessed

differences,

(c) dependence

clinical

The results corrobo-

decreasing

evoked

from the source of the response. The homogeneous

evoked

polyphasic

lation

Unlike

brain-stem

in 5 healthy

of waves I-V,

change (unlike

30. BAEP

interpersonal

and I/V. intensity

no significant

the

latencies

and by some 0. IS msec in the pre-school

(BAEPs)

were

hearing was taken for granted).

STD grows substantially.

prolongation

older children

latencies

for

and condensation

ear was masked with 40 dB

and interpeak

that with shows

except

noticeable

Rarefaction

somatosensory trode distance type

Each group

decreased from 80 to 30 dB nHL in drops of IO

dB each (in the younger especially

in

defect were monitored.

rated separately.

consisted of 30 age-matched artifacts,

especially

aged 3- 14 years with-

clinical

of 2 patients

with

and electrophysiological

gunshot

wounds

symptomatology.

of the