301 attention

visuospatial attention:

selective process 1 physical loc in space to exclusion of others

visuosptial attention task:

posner cueing task -2 trial: congruent, inconguent

compare RT

posner cuing taks see delay of R at loc called? time

inhibiton of return >300ms cue

posner cueing changed 3 features

amt time cue, location cue, appearance cue

posner cueing taks helps separate visospatial attention vs eye gaze- key:

point attention to area seperate from where eyes look

contralat neglect behaviour: is

features-

what type prob?

deficits attend obj in space opp lesion; spatial bias eye mvmt/act to lesion side- R

anosognosia(unaware)

attention- saliency

causes of contralat neglect 3

+1

stroke, truama, AD

contralat neglect brain dysf- damage where side?

3 cortex areas:

where else can= neglect?

subcortical injury = neglect?

RS hemi damage= LS neglect

inf PL & TemporoP junction

sup temp gyrus

ventral frontal cortex

white-matter tract connecting 3 sites

cortical hypoperfusion(R hemi)

subcortical injuries lead to neglect in ? MRI

DWI- diffusion wt image= injury

PWI- persusion wt image= areas delayed b flow

cortical hypoperfusion= neglect

3 major cortex areas of neglect are involvedin ?

spatial orient(attention 2 loc)

network integrates signal eye,body to spatial rep

damage to white-matter tract connecting 3 sites = neglect

neglect is lateralized

R PL rep L&R side space; L PL = only R

tests for neglect: ? 7

clock draw, line cancel, draw -memory/copy-improve, eye mvmt, imagination, visual judgment, line bisection-sev

test neglect: eye mvmt 2 ways

spontaneous orient head/eye sit

scan paths in visual search & rest

test neglect: visual judgment ?

hid thing L side

cannot say what, but pick house wo smoke

1/2 image animal- meaning * to detect error

what are 2 types of neglect

egocentric, obj-centered

types of neglect: egocentric

location, how it shown

IPL/TPJ

space specific

types of neglect: obj-centered

location, how it shown

STG

-go 1 by 1 neglect

types of neglect: egocentric

drawing-copy test?

cancellation/oreint test?circle & c

only R obj drawn

only those in R areas page -accurate

types of neglect: obj-centered

drawing-copy test?

cancellation/oreint test?-circles & c

only R side objs drawn

accurate only C orient; lack L side attention of objs

recovery of neglect sx 2

allesthesia

simultaneous extinction

recovery of neglect sxs: allesthesia

R stim on neglect side-L as if on non-neglect side

-mislocate stim, error process

recovery of neglect sxs: simultaneous extinction

R stim on neglect side unless both sides stim same t- notice ipsil stim

easier stim overrides percept

-test only say R

3 treatment for neglect

prismatic adaptation, VR-reaching, TMS

3 treatment for neglect: prismatic adaptation

improve test?

shift vision R

line cancellation= learn

treatment for neglect: TMS -

improve 2 test

low freq rTMS over L PPC- reduce neglect 15d

line judge, clock draw

balint syndrome behaviour: what

3fx: descript

sev disrupt attention based large region brain damage

lose explict spacial info

prob guide attention, visual guided reach, 1 obj at once

balint syndrome brain dysf where:

due to 3

bilat P-O L

stroke, demetia, trauma

balint syndrome- intact what 4

primary sensory process, lang, memory, judgmt

balint syndrome 3 features

oculomotor apraxia, optic ataxia, simultanagnosia

balint syndrome 3 features: oculomotor apraxia

damage to

sticky fixation

saccade plan area PL (guide attention)

balint syndrome 3 features: optic ataxia

damage to

disorder visually guided reaching esp contralesion hand

sup PL

balint syndrome 3 features: simultanagnosia

inable percieve simult obj/event in visual field- 1 obj only

balint syndrome test optic ataxia:

drawing task 3 things:

prob reach:

prob tracing, draw fine, impaired accuract draw btw line

broad

treat balint syndrome 3

consider

no std, coping strategy help(dial phone)

difficult due to large damage

2 condition visualspacial attention near body

small PPS?2

large PPS? 2

autism, schizophrenia

trait anxiety, claustrophobia

visualspacial attention near body: PPS

space around body prioritied by attention sys- peripersonal space

pseudoneglect &pps

test

in PPS: bias to L in normal indv

outside PPS: bias R

line bisect