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Task 6 (MCADAMS & MAUNSELL (Results (75% Guassian fit (One neuron: …
Task 6
MCADAMS
& MAUNSELL
Research question
Can attention alter tuning curves?
Increase
sensitivity
?
Change in
width
Hypthesis
Narrowing uncommon in
stimulus-stimulus interactions
Methods
and materials
Recordings
Monkey V1 & V4
RF mapped
bar moving
Isolation units
AP > 3x noise
Undriven activity
While fixating (before)
Histology
delayed match-to-sample task
shift
attention
required
Sample stimuli
Gaussian & Gabor
Attended
inside RF
orientation task
Gabors
(optimalised)
Unattended
outside RF
colour task
Gaussians
Instruction cue
(attention to one)
release lever
for match
Results
Behavioural states
same stimuli, different tasks
75% Guassian fit
One neuron:
43% increase
amplitude
(sig)
rest no sig changes
Population (75%):
amplitude
(med 1.26, sig, 20%)
widt (med 1.0, not sig, 9%)
symptote
(med 1.0, skewed right, sig, 13%)
preferred orientation (no sig, 8%)
Population tuning curves:
22% increase
amplitude
13% increase
asymptote
16% Gaussian fit attention only
increase
amplitude
no increase width
All neurons
Population tuning curves:
31% increase
amplitude
13% increase
asymptote
no change width
Multiplicative scaling
slope = 1.32, 32% increase
proportional
(r = 1.00)
Time course
enhancement increased
during time course stimulus
Baseline activity
attention effect only after stimulus (no sig diff baseline)
Data analysis
Orientation tuning curves
Four parameters
amplitude, width (SD), asymptote, mean
Goodness of fit
Quality of fit within
Gaussian
Population-tuning curves
aligned at pref orientation
Discussion
Increase
firing rate
Multiplicative
scaling
Interaction stimulus
attributes
No change
sensitivity
(no change width)
Undriven not changed
by attention (baseline)
REYNOLDS