search for: stimuli

...with a modalDiaglog ( http://bioinf.wehi.edu.au/~wettenhall/RTclTkExamples/modalDialog.html like this ) but I cannot figure out how to do this with multiple values to be read. I want to run a rather simple simulation and the user has to be able to set multiple parameters (say, number of trials and stimuli). The onOK-function should then "collect" these parameters and save them to variables (I guess). Here is a snippet of my code. Could someone tell me what to do? Am I heading in the right direction or is my approach hopeless? :p ----------------------------------------------------------...

I'm relatively new to R and I'm stuck. I'm trying to construct a surface to optimize from a multivariate dataset. The dataset contains the response of a system to various stimuli. I am trying to optimize the mix of stimuli to maximize the response. To do so, I've interpolated the various datasets of type response vs. stimuli and I now have an array of functions "interps" whose length is the length of the array of the names of the various stimuli. I've a...

Hello, I have a dilemma that I'm hoping the R gurus will be able to help resolve. For background: My data is in the form of a (dis)similarity matrix created from taking the inverse of normalized reaction times. That is, each cell of the matrix represents how long it took to distinguish two stimuli from one another-- a square matrix of 45X45 where the diagonal values are all zero (since this represents two identical stimuli). I have been using cmdscale with this matrix as the input-- So: X = cmdscale(mydata,k=44,add=FALSE,eig=TRUE)$points returns a 45x34 matrix because only 34 of the eigen...

...NOVA with repeated measures (in presence of a balanced design)? I am not able to find a good example over internet in R...is there among you someone so kind to give me an hint with a R example please? For example, the aov result of my analysis says that there is a statistical difference between stimuli (there are 7 different stimuli). ...I would like to know which stimuli are involved. > aov1 = aov(response ~ stimulus*condition + Error(subject/(stimulus*condition)), >data=scrd) > summary(aov1) Error: subject Df Sum Sq Mean Sq F value Pr(>F) Residuals 14 227.57 16.255...

...mmoc() but with no luck. I summarize the experiment I performed, and I would ask you an help to show me how to analyze in R my results. I simulated 6 surfaces materials at auditory and visual level, and I asked subjects to evaluate on a 9-point Likert scale the degree of coherence between the two stimuli. For example, there are trials where at auditory level a metal surface was simulated and at visual level the snow surface, or wood both at auditory and visual level. The experiment had only 12 participants, so for each trial I have 12 response (no repeated measures involved). In total there were 3...

.../Documents/Analisi_passi/Codice_R/Statistics_results_bump_hole_Audio_Haptic/tables_for_R/table_realism_wood.txt', header=TRUE, colClasse=c('numeric','factor','factor','numeric')) This table is the result of a simple experiment. Subjects where exposed to some stimuli and they where asked to evaluate the degree of realism of the stimuli on a 7 point scale (i.e., data in column "response"). Each stimulus was presented in two conditions, "A" and "AH", where AH is the condition A plus another thing (let?s call it "H"). Now,...

Dear all, I have carried out a pairwise comparison study that I want to analyze using the BradleyTerry package to establish a rank order of my stimuli. However, BT does not handle ties between stimuli, so I need to find those in my data before I can use that model. The code below goes from the format of my result file(s) to a data frame suitable for BT, but as you can see, there are some ties. I need to find the rows with identical (but swapped)...

...nal hazards model to analyze event histories. I am looking at the responses of sympathetic nervous system activity to a stimulus. The activity I observe is a burst that can only occur once per heart beat cycle (e.g., a binary count). Typically bursts occur in 60-80% of the heart cycles * sensory stimuli can modify these burst probabilities. I give 48 stimuli-trials at random intervals and count the number of bursts associated with the stimuli. For example, a person with 75% burst probability at rest (e.g., 36/48) may have an stimulation induced increase to 87.5% (42 bursts in 48 trials). There...

...hours of data (sampled at 32Hz, 1hr per subject), and one on the corStruct or how to get rid of serial dependencies before lme(). I'm analyzing skin temperature continuously recorded at 32Hz in Baseline (10 min), Testing (~5 min), and Recovery (20 min) epochs of a face recognition experiment. Stimuli are the same in Baseline and Recovery (portrait or landscape), and in testing, participants were tested on their recognition of a list b&w portraits presented just before testing started. On some of the portraits 'learned' the eyes were masked, and in others, the eyes were visible. In t...

...ent where it's essentail to travel to the subjects, not let the subjects come to where the Matlab licences are :-( So I need to use a free software for my experiment if I don't want to by an extra Matlab licence (which I don't want to). Did anyone ever try to do presentation of visual stimuli (images, practically, with a little bit of text in my case) with R? I looked into the documentation of rgl, but what's lacking there is (as far as I saw) the possibility to also read (unbuffered) keyboard input. So what I need is: 1. put images onto the (full!)screen (qick) 2. read keyboa...

Dear R Help, I have a general question - I know this is the R list, but I hope someone can help me out a little as I've always found the help here to be absolutely fantastic. I have run a psychological study where participants are given multiple stimuli and their responses to those stimuli are measured on the same numerical scale, i.e., the data is something like Participant Stimulus Measurement p1 s`1 5 p1 s`2 6.1 p1 s`3 7 p2 s`1 4...

Dear list member, I deperately need an help in performing a MANOVA in R, but I encountered some problems both in the design and in the synthax with R. I conducted a listening experiment in which 16 participants had to rate the audio stimuli along 5 scales representing an emotion (sad, tender, neutral, happy and aggressive). Each audio stimulus was synthesized in order to represent a particular emotion. Participants had to move 5 sliders each of which corresponded to one of the 5 emotions. The sliders range was [0,10] but particip...

Hello, I am trying to test some results I have for significance. It has been recommended that I use R and I am completely new to this. Set-up: Groups: two groups of 8 subjects (16 total) Two conditions: alert and passive Measurements: responses for three different stimuli (A, B, and C) measured in each condition Experiment: Testing the order of conditions Group one: Alert A, B and C followed by Passive A, B, and C Group two: Passive A, B, and C followed by Alert A, B, and C Stimuli A, B and C are randomly interleaved in the experiment, does this matter in...

This is to announce a new package MLCM on CRAN. The package provides functions for estimating perceptual scales by maximum likelihood from data collected in a conjoint measurement experiment. Data for conjoint measurement are typically collected using a psychophysical procedure. The stimuli vary along 2 or more dimensions. The observer views pairs of stimuli and judges which stimulus of each pair is higher on a specified dimension. For example, stimuli may be goods baskets containing amounts of milk and honey (dimensions) and the subject may order each pair of baskets by subjective d...

...I have tried to use R for the repeated measures experiment design in a phonetic study, and in the resulting forms I met some problems which perturb the final interpretation of the results. I will explain the experiment design first: the same 7 subjects were answering a question about 25 linguistic stimuli; the stimuli were the same utterances which were processed in 3 different ways (3 conditions), ie each subject listened 25*3 stimuli. I would like to test the effect of condition and of the stimulus on the subjects' performance. My dependent variable is Nboundaries . I think there is: one rando...

This is to announce a new package MLCM on CRAN. The package provides functions for estimating perceptual scales by maximum likelihood from data collected in a conjoint measurement experiment. Data for conjoint measurement are typically collected using a psychophysical procedure. The stimuli vary along 2 or more dimensions. The observer views pairs of stimuli and judges which stimulus of each pair is higher on a specified dimension. For example, stimuli may be goods baskets containing amounts of milk and honey (dimensions) and the subject may order each pair of baskets by subjective d...

Hi, I would like to compare to regression models - each model has a different dependent variable. The first model uses a number that represents the learning curve for reward. The second model uses a number that represents the learning curve from punishment stimuli. The first model is significant and the second isn't. I want to compare those two models and show that they are significantly different. How can I do that? Thank you. [[alternative HTML version deleted]]

Hi I am running Mac OX tiger with the installed ruby 1.8.2, and mysql5 (I checked that it was running in preference). I tried to run the various fixes recommended in agileweb. I am stuck on page 57, script/generate scaffold... > Could you paste in your database.yml file, from the > "config" folder inside your Rails app? If you have any > passwords entered there, you should

...171 hole_2_combination_W_realism AH 6 172 hole_2_combination_W_realism AH 2 173 hole_2_combination_W_realism AH 4 My goal is to understand if condition AH is better than condition A (i.e. if there is statistical significance between the evaluation of stimuli presented in condition A and AH). The same stimuli have been presented to subjects in two conditions: A and AH, where AH is the condition A plus something elese (let´s call it "H"). I want to know if adding "H" bring to better results in the participants evaluations of...

...am more concerned with it being the target of a Spectre style attack. There's some long lived private data (host keys in the case of sshd, session keys in the case of ssh and sshd and user keys in the case of ssh-agent) and there's some scope to manipulate their behaviour through external stimuli. -- Darren Tucker (dtucker at dtucker.net) GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860 37F4 9357 ECEF 11EA A6FA (new) Good judgement comes with experience. Unfortunately, the experience usually comes from bad judgement.