Summary of pre-processing and selectivity

Number of sites

Preprocessing

Selectivity

Left-out cases

Dependence on thresholds and parameters

Selectivity distribution

Number of sites

MUA

number of sites included in analysis = 356

number of sites excluded from analysis
60/120/hfn non-IT STS unstable no data slope
n_out_mua 12 30 12 26 31 166

LFP

number of sites included in analysis = 309

number of sites excluded from analysis
60/120/hfn non-IT STS unstable no data slope
n_out_lfp 108 30 12 25 94 62

60/120/hfn = peaks at 60 Hz or harmonics or high-frequency noise
non-IT = sites outside IT or STS
STS = sites in STS
unstable = unstable recordings
no data = sites without enough number of repetitions
slope = number of sites with change in slope larger than threshold (MUA [0.77 1.30], LFP [0.77 1.30])

Preprocessing

MUA

mean s.d. min max median n
pres 10.33 1.92 7.72 20.03 10.01 356
change stim mua 1.04 0.13 0.78 1.29 1.04 356
change bckg mua 1.04 0.13 0.66 1.38 1.03 356
cv stim 0.89 0.13 0.46 1.37 0.89 356
cv bckg 0.86 0.14 0.54 1.31 0.85 356
Distributions figure (plots with frequency distribution of pres, change stim mua, change bckg mua, cv stim and cv bckg)

LFP

mean s.d. min max median n
change stim lfp 1 0.98 0.12 0.78 1.29 0.96 309
change bckg lfp 1 1.08 1.29 0.34 23.30 0.96 309
Distributions figure (plots with frequency distribution of change stim lfp and change bckg lfp)

pres = number of repetitions of each image
change stim = average response during last repetition / average response during first repetition, stimulus interval
change bckg = average response during last repetition / average response during first repetition, background interval
CV = coefficient of variation of the interspike interval distribution

Selectivity

MUA

number of selective sites

stimulus background
nsites selective percentage selective nsites selective percentage selective
MUA 279 78.37 0 0.00

nsites selective = number of sites with p ANOVA < threhsold=0.001000
percentage selective = percentage of total sites analyzed that were selective
stimulus = stimulus interval [100;300) ms with respect to stimulus onset
background = background interval [-200;0) ms with respect to stimulus onset

number of selective images and variance ratio

number of sites with at least 1 selective image = 248 (69.66 %)
mean s.d. min max median n
n sel mua 2.85 2.09 0.00 11.00 2.00 279
r stim mua 3.62 2.07 1.62 19.61 3.10 279
Distributions figure (plots with frequency distribution of n sel mua and r stim mua

n sel MUA = number of images that had p < threshold=0.001000 in the post-hoc t test
r stim MUA = across picture variance / within picture variance

LFP

number of selective sites

stimulus background
LFP variable nsites selective percentage selective nsites selective percentage selective
1 max(LFP)-min(LFP) 156 50.49 0 0.00
2 msa power 140 45.31 0 0.00
3 [0;10) Hz 138 44.66 0 0.00
4 [10;20) Hz 122 39.48 0 0.00
5 [20;30) Hz 21 6.80 0 0.00
6 [30;40) Hz 14 4.53 0 0.00
7 [40;100) Hz 41 13.27 0 0.00
8 [100;300) Hz 145 46.93 1 0.32

number of selective images and variance ratio

mean s.d. min max median n
number of sites with 1 selective image max(LFP)-min(LFP) 111 35.92
n sel lfp max(LFP)-min(LFP) 2.05 2.24 0.00 17.00 1.00 156
r stim lfp max(LFP)-min(LFP) 3.34 1.67 1.62 10.54 2.81 156
number of sites with 1 selective image msa power 72 23.30
n sel lfp msa power 1.16 1.78 0.00 14.00 1.00 140
r stim lfp msa power 3.08 1.39 1.63 10.26 2.59 140
number of sites with 1 selective image [0;10) Hz 109 35.28
n sel lfp [0;10) Hz 1.86 1.57 0.00 8.00 2.00 138
r stim lfp [0;10) Hz 3.03 1.22 1.64 6.36 2.63 138
number of sites with 1 selective image [10;20) Hz 21 6.80
n sel lfp [10;20) Hz 0.35 0.97 0.00 5.00 0.00 122
r stim lfp [10;20) Hz 2.84 0.99 1.63 5.80 2.66 122
number of sites with 1 selective image [20;30) Hz 0 0.00
n sel lfp [20;30) Hz 0.00 0.00 0.00 0.00 0.00 21
r stim lfp [20;30) Hz 1.84 0.16 1.64 2.25 1.79 21
number of sites with 1 selective image [30;40) Hz 2 0.65
n sel lfp [30;40) Hz 0.21 0.58 0.00 2.00 0.00 14
r stim lfp [30;40) Hz 1.94 0.31 1.61 2.61 1.90 14
number of sites with 1 selective image [40;100) Hz 18 5.83
n sel lfp [40;100) Hz 0.68 0.99 0.00 4.00 0.00 41
r stim lfp [40;100) Hz 2.06 0.60 1.63 5.24 1.95 41
number of sites with 1 selective image [100;300) Hz 103 33.33
n sel lfp [100;300) Hz 1.61 1.48 0.00 7.00 2.00 145
r stim lfp [100;300) Hz 2.83 1.75 1.63 16.64 2.32 145
r bckg lfp [100;300) Hz 1.66 0.00 1.66 1.66 1.66 1
Distributions figure

selectivity for the cases that are left out

MUA

60/120/hfn non-IT STS unstable no data slope
n_out_mua 12 30 12 26 31 166
nsites_sel_stim_mua2 3 0 8 8 2 117
psites_sel_stim_mua2 25 0 67 31 6 70
nsites_sel_bckg_mua2 0 0 0 0 0 0
psites_sel_bckg_mua2 0 0 0 0 0 0

LFP

60/120/hfn non-IT STS unstable no data slope
n_out_lfp 108 30 12 25 94 62
nsites_sel_stim_lfp2 max(LFP)-min(LFP) 21 0 2 2 3 10
psites_sel_stim_lfp2 max(LFP)-min(LFP) 19 0 17 8 3 16
nsites_sel_bckg_lfp2 max(LFP)-min(LFP) 1 0 0 0 0 0
psites_sel_bckg_lfp2 max(LFP)-min(LFP) 1 0 0 0 0 0
nsites_sel_stim_lfp2 msa power 24 0 1 0 1 5
psites_sel_stim_lfp2 msa power 22 0 8 0 1 8
nsites_sel_bckg_lfp2 msa power 0 0 0 0 0 0
psites_sel_bckg_lfp2 msa power 0 0 0 0 0 0
nsites_sel_stim_lfp2 [0;10) Hz 3 0 2 1 2 8
psites_sel_stim_lfp2 [0;10) Hz 3 0 17 4 2 13
nsites_sel_bckg_lfp2 [0;10) Hz 0 0 0 0 0 0
psites_sel_bckg_lfp2 [0;10) Hz 0 0 0 0 0 0
nsites_sel_stim_lfp2 [10;20) Hz 3 0 0 0 1 5
psites_sel_stim_lfp2 [10;20) Hz 3 0 0 0 1 8
nsites_sel_bckg_lfp2 [10;20) Hz 0 0 0 0 0 0
psites_sel_bckg_lfp2 [10;20) Hz 0 0 0 0 0 0
nsites_sel_stim_lfp2 [20;30) Hz 2 0 0 0 0 1
psites_sel_stim_lfp2 [20;30) Hz 2 0 0 0 0 2
nsites_sel_bckg_lfp2 [20;30) Hz 0 0 0 0 0 0
psites_sel_bckg_lfp2 [20;30) Hz 0 0 0 0 0 0
nsites_sel_stim_lfp2 [30;40) Hz 0 0 0 0 0 2
psites_sel_stim_lfp2 [30;40) Hz 0 0 0 0 0 3
nsites_sel_bckg_lfp2 [30;40) Hz 1 0 0 0 0 0
psites_sel_bckg_lfp2 [30;40) Hz 1 0 0 0 0 0
nsites_sel_stim_lfp2 [40;100) Hz 4 0 0 0 0 3
psites_sel_stim_lfp2 [40;100) Hz 4 0 0 0 0 5
nsites_sel_bckg_lfp2 [40;100) Hz 1 0 0 0 0 0
psites_sel_bckg_lfp2 [40;100) Hz 1 0 0 0 0 0
nsites_sel_stim_lfp2 [100;300) Hz 29 0 6 5 2 24
psites_sel_stim_lfp2 [100;300) Hz 27 0 50 20 2 39
nsites_sel_bckg_lfp2 [100;300) Hz 0 0 0 0 0 1
psites_sel_bckg_lfp2 [100;300) Hz 0 0 0 0 0 2

 

Dependance on thresholds and parameters

 

 

 statistical threshold
    0.01 0.001 0.0001
slope interval [0.77;1.3] stats stats stats
[0.5;2.0] stats stats stats
[0.25,4.0] stats stats stats

For each value of the statistical threshold (for the ANOVA analysis and post-hoc comparisons) and for each possible interval for the signal slope, the table provides a link to several table summarizing the total number of sites, the number of selective sites, and the distribution of selective units. The colored entry corresponds to the default parameters used in the summary of results above.

Distribution of selective responses

Number of sites selective to each of the images and groups. (A) MUA activity, selectivity to images. (B) LFP activity, selectivity to images. (C) MUA activity, selectivity to groups. (D) LFP activity, selectivity to groups. The names of the 9 different groups and the number of images in each group are shown to the right. p value threshold for selectivity = 0.001.

GK, last updated 07/23/2004

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