Acuity and Retinal
Location Lab Part II
Background:
- Purpose and Goals
- to measure and see how acuity deteriorates as the
stimulus is moved farther from the fovea
- to develop some understanding of what is an
experiment
- To begin to learn how to design an experiment to
answer a question
- to compare data to hypothesis
- To expand our understanding of Acuity
- To develop skills in doing graphs and calculations
in Excel
The Experiment:
- Stimulus Settings:
- Stimulus Type: Choose either: Vernier, Motion
Jump, Motion Smooth (just one)
- Contrast: Do not change, as last time
- Stimulus Positions: Use same as last time
- Background Level: Do not Change
- Experimental Method Settings:
- Number of Levels of Critical Feature Size: Same as
last time
- Number of staircases: Same as last time
- Minimum Value of Critical Feature Size: 0.1
- Maximum Value of Critical Feature Size: 10 (Same as
last time)
- Procedure:
- Make the browser fill the screen.
- Place your head centered on the screen 24" from
the monitor surface.
- Fixate on the red fixation mark. Do not move
your eyes from that spot.
- The stimulus will be presented at the position you
chose for this condition.
- If you see it, press the yes button or the z key.
- If you do not see it, press the no button or the /
key.
- The threshold is calculated at the end of the
experiment.
- Press the Show Threshold button to display
the threshold and then record your results.
- Remember how the threshold is calculated
- Here
is the link to the lab.
- Write-up: (Method, Results, Summary)
- Week 1:
- Nothing Due
- Week 2: Graphing Results with Error Bars
- Do a graph of your results to hand in on
Moodle.
- Your graph should be and x-y scatter plot with
points connected by straight line connectors
- Put error bars around mean values.
- Week 3: Abbreviated Lab Report with the following
sections:
- Method: Your method must include the following
subsections:
- Participants: A brief description of
who was in your experiment. You need
data from all members of your group
- Stimulus: A description of all stimuli used
and your calibration
- Equipment: What equipment you used
- Procedure: How you collected the data
- Results: a description of your findings
- Use your data and the data from the other
member(s) of your group.
- Summary: Do your results match your
expectations, listed at the beginning of this page
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