The function of learning is clear: modifying behavior through experience. Memory, the storage of information that supports learning, is clearly necessary and valuable. Current psychology and neuroscience tell us that there are two memory systems enabled by separate neural systems. Procedural memory relies on reward circuitry and trial-and-error processes to mold efficient behaviors. Episodic memory stores specifc events in the life of the individual — but for what purpose? Continue reading
My post on the brainfacts blog, “Let’s stop using the term “Hard Wired“. Intended to get people to think more carefully and avoid sloppy metaphors.
In 1981 I was an eager post-doctoral fellow, learning to record place cell’s in Jim Ranck’s lab and beginning to understand John O’Keefe and Lynn Nadel’s “Cognitive Map” theory of the hippocampus. One afternoon, while I had a rat in the maze and watched traces of action potentials sweep by on the oscilloscope, Jim Ranck looked over my should and said …
“This is terrific! Place cells are the gateway to understanding how the brain produces cognition.”1
This was both inspirational and opaque. Continue reading
“I still believe in Santa Claus. I think I’ll believe in Santa one more year.”
There are several amazing things in this statement. Continue reading
I’ve made a posting on the BrainsFacts Blog site on Grid Cells and Path Integration. Aimed at High School and College students, but I think it gets complicated. Write your comments here!
Also, planning a third post or the Modular organization of Grid Cells. Based on new paper “Specific evidence of low-dimensional continuous attractor dynamics in grid cells” (Yoon et al) published in Nature Neuroscience.
Three years ago the New England Journal of Medicine published a remarkable case study : “Cycling for Freezing Gait”. The report from doctors in the Netherlands describes a man with severe Parkinson’s disease who was virtually unable to walk, but, when put on a bike, rode beautifully, including the ability to turn, raise off the seat for power, and comfortably dismount.
Yesterday evening Deron Williams drained 8-straight 3-point shots at the start of the Brooklyn Nets’ win against the Washinton Wizzards (Nets, my team!). He was ‘hot’. He was on a streak. He was in rhythm. As Deron said, at the end of the streak, “yeah, I was on a heat check”.
Was it a real streak? Was he hot? In synch? If there are streaks, what does that say about human athletic performance and neuroscience?
Stephen Gould addressed the question* of whether there are streaks in athletic performance 25 years ago in a lovely article in the NY Review of books (1988). Interestingly, Gould focused on two types of streaks: streak shooting in basketball, and Joe Dimaggio’s 56-game hitting streak. He summarized then current work by Arvin Tversky and Ed Purcell, using fairly simple probability techniques. Conclusion: from NBA shot statistics were there no evidence of “hot streaks” or “hot hands” in basketball; but the DiMaggio’s streak was truly unusual. I don’t have ready access to the background work (correction: Golovich et al, 1985**), nor more recent analysis, but I did a back-of-the envelope calculation this morning.
My calculations: Continue reading