Dangerous Minds

Dangerous Minds is a quest and achievement/trophy in Fallout 4.

Quick walkthrough

 * 1) Retrieve a Piece of Kellogg’s brain
 * 2) Talk to Doctor Amari
 * 3) Sit in the Memory Lounger

Detailed walkthrough
Lounging Around At The Memory Den

Kellogg has kindly allowed you to use a bit of his brain—the cybernetic brain augmenter —to delve deep into his memories. Gather it from Fort Hagen (as part of the previous quest, Reunions) if you haven't already.

Follow Nick Valentine’s advice and locate Doctor Amari. This involves a trip into Boston, through the ruins of the Financial District, to the rough-and-tumble fortified settlement of Goodneighbor. Greet the locals, then head to the Memory Den. Irma owns this establishment.

Down in the basement, converse with Doctor Amari. After Nick Valentine volunteers to help out, you’re invited to sit in the lounger to experience snippets of Kellogg’s past.

Bugs

 * Sometimes after leaving the quest in the Memory Den, one can get stuck with the memory lighting effect. This causes a desaturation of colors, and turning many things grey or blue, as well as adding a distinct blur to the foreground.
 * Sometimes after leaving the Memory Den, one can be stuck in the quest, without it finishing, and no way to go back to the memories in order to complete the quest objective: "Explore Kelloggs Memories." Valentine will be missing, and Doctor Amari will be "Busy". While attacking Doctor Amari might be a possible fix, saving and reloading can get the quest to continue, too.
 * Sometimes the quest will not begin after the conversation with Nick Valentine and Piper. Reverting to a save before the conversation may help.
 * Sometimes after speaking to Doctor Amari and being asked to sit in the lounge chair, when going to sit in the chair one are unable to do so since "You cannot complete this action in combat" despite not being in combat with anyone. This is on PC and may also be on both consoles.
 * Sometimes, power armor worn by Valentine can change ownership to the NPC after exiting the lounge chair. If the player tries to enter the power armor, a "steal power armor" prompt will replace the "enter power armor" prompt. Valentine will turn hostile if entered.