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--- research:holes_crowding [2014/09/08 21:06] – Page moved from holes_crowding to research:holes_crowding admin
+++ research:holes_crowding [2019/05/22 16:08] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Design notes ======
+[[internal:holes_crowding|Practical Notes (lab members only)]]
-Great article for methods:
+[[research:holes_crowding_vss2016_abstract|VSS 2016 abstract (submitted)]]
-http://www.journalofvision.org/content/13/1/24
-Visual angle of letters:
-Boots CRT monitor is 36.5 cm wide. Comfortable sitting distance for AC is 50cm exactly, so use this as viewing distance. Currently, PTB whole-screen window is 1024 pixels wide, so 20.48 px/cm.
-NOTE: this size is for use with the boots PC and monitor only! This pixel size is tiny on diego's monitor.
-Strasburger & Malania used 4 deg. eccentricity targets
-deg. at 50cm on the boots CRT monitor: 3.49cm = 71.47px ~ 71 px.
-.5 deg at 50cm on boots CRT: .44cm = 9.01 ~ 9 px.
-Can use stimulus width as the distance between flankers.
-Plan: scale these numbers up, but keep the ratios.
-First try: if boots CRT is 1024 px wide, can go up to almost 512 px eccentricity, 512/71 ~ 7.  So let's scale up by 5 to be safe:
-Place target at 71*5 ~ 350 px away from fixation cross (which should be at the center of the monitor)
-Make targets 9*5 = 45 px tall and 45 pixels apart.