Sense-organ stimuli can cause different sense qualities {synesthesia, perception}|.
colors
White numeral symbol can have color. However, Roman numeral can have no color when the Arabic numeral of same number has color, indicating that synesthesia is for perception, not abstract concept.
Perhaps, connections between brain areas V4 and area in V8 {number-grapheme area}, which are adjacent in fusiform gyrus, cause color-numeral synesthesia.
Months and weekdays can have colors. Perhaps, connections between TPO and angular gyrus areas cause day-month and numeral synesthesia.
tastes
Shapes can have associated tastes. Insula is for tastes and is close to sensory hand area.
sounds
Shapes can have associated sounds. Low sounds can associate with dark colors, and high sounds with light colors [Cytowic, 1989] [Cytowic, 1993] [Cytowic, 2002] [Galton, 1997] [Grossenbacher and Lovelace, 2001] [Nunn et al., 2002] [Paulesu et al., 1995] [Ramachandran and Hubbard, 2001] [Ramachandran and Hubbard, 2003] [Ramachandran, 2004] [Stein and Meredith, 1993] [Stein et al., 2001].
factors: age
Infants have cortex and thalamus auditory-visual brain connections.
factors: brain
Brain regions can activate each other through atypical stimulation pathways or through inhibition pathway loss.
factors: drugs
Drugs can cause stimuli in sense organs to result in another sense's sense qualities.
properties: occurrence
Less than 0.5% of people have synesthesia, usually as just black and white colors. Such synesthesia is involuntary, starts early in life, and lasts a lifetime. It is hereditary. It happens more in lefthandedness, more in females, more with better memory, more with bad math and spatial ability, and more in creative people [Baron-Cohen and Harrison, 1997].
properties: unconscious
Synesthesia is not under conscious control.
Social Sciences>Psychology>Cognition>Perception>Properties
6-Psychology-Cognition-Perception-Properties
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Date Modified: 2022.0224