From the description of synaptic static (XGtE, p. 167; emphasis mine):
You choose a point within range and cause psychic energy to explode there. Each creature in a 20-foot-radius sphere centered on that point must make an Intelligence saving throw. A creature with an Intelligence score of 2 or lower can’t be affected by this spell. A target takes 8d6 psychic damage on a failed save, or half as much damage on a successful one.
After a failed save, a target has muddled thoughts for 1 minute. During that time, it rolls a d6 and subtracts the number rolled from all its attack rolls and ability checks, as well as its Constitution saving throws to maintain concentration. The target can make an Intelligence saving throw at the end of each of its turns, ending the effect on itself on a success.
Can this condition be removed with Dispel Magic?
Does "Magic Resistance" (advantage on saving throws against spells and other magical effects.) gives you advantage against INT saves to remove this effect?
It seems more like a concussion rather than a magical effect from a spell.