From 12b04d9160d0433f6091fee280935999fde52c23 Mon Sep 17 00:00:00 2001 From: sonnenberg Date: Mon, 1 Feb 2021 19:27:54 +0100 Subject: [PATCH 1/3] nothing serious --- projects/project_eyetracker/eyetracker.tex | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/projects/project_eyetracker/eyetracker.tex b/projects/project_eyetracker/eyetracker.tex index 50d4c34..1e703e5 100644 --- a/projects/project_eyetracker/eyetracker.tex +++ b/projects/project_eyetracker/eyetracker.tex @@ -15,7 +15,8 @@ subjects were viewing biblical images while their eye movements were recorded. In the accompanying datasets you find a subject's eye tracking data when viewing two different images -(\emph{Genesis\_VIII.png} and \emph{Genesis\_XXXIX.png}, files \verb+1_1.mat+ and \verb+1_2.mat+, respectively). Each \verb+mat+-file contains five variables: \verb+frame_index+, the \verb+gaze_x+ and \verb+gaze_y+ position (in pixel on the screen), a boolean vector \verb+eye_found+ telling whether the tracker could actually estimate the eye position, and a vector \verb+marker+. The \verb+marker+ is used to indicate sections in the data. 0 can be ignored, 1 marks the fixation period and 2 indicates the acutal trial. +(\emph{Genesis\_VIII.png} and \emph{Genesis\_XXXIX.png}, files \verb+1_1.mat+ and \verb+1_2.mat+, respectively). The experiment consisted of different +Each \verb+mat+-file contains five variables: \verb+frame_index+, the \verb+gaze_x+ and \verb+gaze_y+ position (in pixel on the screen), a boolean vector \verb+eye_found+ telling whether the tracker could actually estimate the eye position, and a vector \verb+marker+. The \verb+marker+ is used to indicate sections in the data. 0 can be ignored, 1 marks the fixation period and 2 indicates the acutal trial. The screen was 37.6\,cm wide and 30.1\,cm high and had a resolution of 1280\,x\,1024\,pixel. The distance between subject's eyes and the screen was 50\,cm. The eyetracker recorded ey positions with 60\,Hz. The fixation point was shown at the center of the screen and can be used to compensate for possible offests in the \verb+gaze_x+ and \verb+gaze_y+ positions. From 9e2d17cbc6921969d0e71313b2f947b9b22039e6 Mon Sep 17 00:00:00 2001 From: sonnenberg Date: Mon, 1 Feb 2021 19:34:27 +0100 Subject: [PATCH 2/3] added short experimental description to eye-tracker project and fixed some errors --- projects/project_eyetracker/eyetracker.tex | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/projects/project_eyetracker/eyetracker.tex b/projects/project_eyetracker/eyetracker.tex index 1e703e5..e099b83 100644 --- a/projects/project_eyetracker/eyetracker.tex +++ b/projects/project_eyetracker/eyetracker.tex @@ -15,8 +15,8 @@ subjects were viewing biblical images while their eye movements were recorded. In the accompanying datasets you find a subject's eye tracking data when viewing two different images -(\emph{Genesis\_VIII.png} and \emph{Genesis\_XXXIX.png}, files \verb+1_1.mat+ and \verb+1_2.mat+, respectively). The experiment consisted of different -Each \verb+mat+-file contains five variables: \verb+frame_index+, the \verb+gaze_x+ and \verb+gaze_y+ position (in pixel on the screen), a boolean vector \verb+eye_found+ telling whether the tracker could actually estimate the eye position, and a vector \verb+marker+. The \verb+marker+ is used to indicate sections in the data. 0 can be ignored, 1 marks the fixation period and 2 indicates the acutal trial. +(\emph{Genesis\_VIII.png} and \emph{Genesis\_XXXIX.png}, files \verb+1_1.mat+ and \verb+1_2.mat+, respectively). The experiment consisted of different trials. Each trial started with a fixation period, followed by the important free eye-movement part. +Each \verb+mat+-file contains five variables: \verb+frame_index+, the \verb+gaze_x+ and \verb+gaze_y+ position (in pixel on the screen), a boolean vector \verb+eye_found+ telling whether the tracker could actually estimate the eye position, and a vector \verb+marker+. The \verb+marker+ is used to indicate sections in the data. 0 can be ignored, 1 marks the fixation period and 2 indicates the actual trial. The screen was 37.6\,cm wide and 30.1\,cm high and had a resolution of 1280\,x\,1024\,pixel. The distance between subject's eyes and the screen was 50\,cm. The eyetracker recorded ey positions with 60\,Hz. The fixation point was shown at the center of the screen and can be used to compensate for possible offests in the \verb+gaze_x+ and \verb+gaze_y+ positions. @@ -31,7 +31,7 @@ The eyetracker recorded ey positions with 60\,Hz. The fixation point was shown a \question Characterize the eye movements statistically. \begin{parts} - \part Calculate with eye speed and/or accelerations. + \part Calculate the eye speed and/or accelerations. \part Create a 'heatmap' plot of the eye-positions. From 102ff0796999e2a8a9bf08885d5643b23997d5e0 Mon Sep 17 00:00:00 2001 From: Jan Grewe Date: Mon, 1 Feb 2021 21:21:57 +0100 Subject: [PATCH 3/3] textual changes --- projects/project_adaptation_fit/adaptation_fit.tex | 10 ++++------ projects/project_photoreceptor/photoreceptor.tex | 6 +++--- 2 files changed, 7 insertions(+), 9 deletions(-) diff --git a/projects/project_adaptation_fit/adaptation_fit.tex b/projects/project_adaptation_fit/adaptation_fit.tex index 1f803a2..53de3a1 100644 --- a/projects/project_adaptation_fit/adaptation_fit.tex +++ b/projects/project_adaptation_fit/adaptation_fit.tex @@ -8,19 +8,17 @@ \begin{document} \input{../instructions.tex} - +Sensory adaptation is a process that results in a reduced sensitivity of the sensory system to a stimulus. One of the best known examples might be the light adaptation of the eye to constant illumination. The light adaptation that we all know depends on a multitude of processes that regulate the eye sensitivity. Adaptation is not limited to the visual system but is observed even in the responses of individual neurons. Stimulating a neuron with a constant stimulus for an extended period -of time often results in a decay of an initially strong response. This -process is called adaptation. Your task here is to estimate the -time-constant of the firing-rate adaptation in P-unit electroreceptors -of the weakly electric fish \textit{Apteronotus leptorhynchus}. +of time often results in a decay of an initially strong response. Your task here is to analyze the spike-frequency adaptation observed in the p-type electroreceptor afferents (aka. P-units) in the electrosensory periphery of the +of the weakly electric fish \textit{Apteronotus leptorhynchus}. P-units are driven by the fish's own electric field and changes of field's amplitude leads to a modulation of the cell's firing rate. Extended stimulation with an increased field amplitude allows to observe the exponentially decaying firing rate. While the light adaptation of the human eye is relatively slow, the firing rate adaptation observed in P-units is quite fast. It is your task to estimate how fast it is. \begin{questions} \question In the accompanying datasets you find the \textit{spike\_times} of an P-unit electroreceptor to a stimulus of a certain intensity, i.e. the \textit{contrast} which is also stored in the file. The contrast of the stimulus is a measure relative to - the amplitude of fish's field and is given in percent. The data is sampled + the amplitude of fish's own field amplitude and is given in percent. The data is sampled with 20\,kHz sampling frequency and spike times are given in milliseconds (not seconds!) relative to stimulus onset. \begin{parts} diff --git a/projects/project_photoreceptor/photoreceptor.tex b/projects/project_photoreceptor/photoreceptor.tex index c31c05d..72413c5 100644 --- a/projects/project_photoreceptor/photoreceptor.tex +++ b/projects/project_photoreceptor/photoreceptor.tex @@ -12,14 +12,14 @@ %%%%%%%%%%%%%% Questions %%%%%%%%%%%%%%%%%%%%%%%%% \section*{Light responses of an insect photoreceptor.} -Fly R\,1--6 photoreceptors respond to light-on stimuli with graded membrane +Insect R\,1--6 photoreceptors respond to light-on stimuli with graded membrane potential changes. In the acompanying datasets you find the membrane -potential of a single R\,1-6 photoreceptor that was recorded while the receptor was +potential of a single R\,1-6 photoreceptor from the fly \textit{Calliphora vicina}. The receptor was stimulated with a light stimulus of different amplitudes. \begin{questions} \question{} The accompanying dataset (photoreceptor\_data.zip) - contains seven mat files. Each of these holds the data from one + contains seven mat files. Each of these holds the data recorded with one stimulus intensity and contains three variables. (i) \textit{voltage} a matrix with the recorded membrane potential from 10 consecutive trials, (ii) \textit{time} a matrix with the