Experiment Background:

1. Method of constant stimuli. Decided on4-6 distances to test, including the smallest ~2mm. The Participant closed their eyes while the Researcher used the compass to gently touch one or twoof the prongs onto the participant's skin (just barely touch the surface of the skin). The participant answered "Did you perceive two points?" (yeso). The Recorder took note of each answer under each distance as well as whether the Researcher did use 1 or 2 prongs. Presented each distance at least 5 times with a mix of 1 and 2 contact points.

2. Method of adjustment. Started at the smallest distance gently touch both prongs to the participant's skin. Gradually spread the prongs until the participant notices two points. Recorded this distance between prongs.

INSTRUCTIONS:

Answer the questions below in association to the results. The experiment has already been performed!

Results:

Region: Finger tip Region: Palm Region: Back Distance: 2mm Distance: 2mm Distance: 2mm Number of Number of Number of points points points applied by applied by applied by researcher researcher researcher 2 2 2 Was Answer: 0 Was Answer: 0 1 Was Answer: 0 there Yes, there there Yes, there there Yes, there two is two two s two two is two points? points points? points points? points Answer: 1 2 Answer: 3 1 Answer: 3 2 No, there No, there No, there is one is one is one point point point Distance: 5mm Distance: 5 mm Distance: 10mm Number of Number of Number of points points points applied by applied by applied by researcher researcher researcher 2 2 2 1 Was Answer: 2 1 Was Answer: 2 Was Answer: 0 there Yes, there there Yes, there there Yes, there two is two two is two two is two points? points points? points points? points Answer: 0 2 Answer: 2 Answer: 3 2 No, there No, there No, there is one is one is one point point point Distance: 8mm Distance: 10mm Distance: 20mm Number of Number of Number of points points points applied by applied by applied by researcher researcher researcher 2 1 2 1 2 1 Was Answer: 3 0 Was Answer: 3 0 Was Answer: 2 there Yes, there there Yes, there there Yes, there two is two two is two two is two points? points points? points points? points Answer: 2 Answer: 0 2 Answer: No, there No, there No, there is one is one is one point point point{a} Degrees of convergence [b] Spatial summation High Moderate No LOW firing Moderate High convergence convergence convergence rate ring rate ring rate Cones Neural signals " ii i i i Retinal ganglion cell Action potentials $_ mixing light [it] Acuity High convergence. low acuity No convergence, high acuity t Baseline Same signal sent Different patterns of signals into optic nerve sent into optic nerve