Marr’s Levels of Analysis
Computation: what problem does cognition solve?
Algorithm: what processing steps does it follow?
Implementation: how is this physically carried out?
How do we measure similarity?
Universal Law of Generalisation
The probability of generalising from one stimulus to another decreases exponentially as a function of dissimilarity.
Goldstone 1994 study
Hodgetts and Hahn 2012 study
Found that square-triangle to square-square is 1 transformation, but other direction is two.
Deductive reasoning
Using facts to reach a logically certain conclusion
Inductive reasoning
Using facts to reach a plausible conclusion (but with room for doubt)
Valid outcomes of deductive reasoning
Invalid outcomes of deductive reasoning
Wason selection task
Rule: if there’s an R on one side, there’s a 2 on the other. Which cards do u flip?
- Most people will flip R and 2, which are both affirmatory arguments (modus ponens and affirming the consequent).
- They should flip R and 7 (modus ponens and modus tollens)
Indicative vs Deontic Arguments
Indicative: if this, then that.
Deontic: if this, then you should that.
People much better at checking the right things when it’s a Deontic argument
Features of indicative arguments
Logical fallacies
Hahn and Oaksford 2007 study
Found that circular arguments were found to be more believable when the alternative was less plausible.
Social cognition and premise montonicity
Ransom, Perfors and Navarro study
Limitations: limited range of arguments and phenomena.
Results: premise non-monotonicity when relevant-relevant, neutral-relevant and neutral-random (in decreasing order), premise monotonicity when random-random
Cognitive penetrability
The notion that perception can be influenced by knowledge, motivations or beliefs (New Look movement)
New Look Movement
Bruner and Goodman: children estimated size of coins to be larger than identically sized discs
Proffitt et al: heavy backpacks make distances look further
Bhalla and Proffitt: tired people perceive slopes to be steeper
Things we want look closer than things we dong
Inattentional blindness
Failure to notice a stimulus that would be easily noticeable if it were attended
Mack and Rock, 1998: gorilla experiment and judging cross size
Unconscious interference and example
Perception arising from the minds guesswork and problem-solving.
Amodal completion: minds ability to complete views hidden behind occlusion
Inattentional blindness and road safety
Scholl, Noles, Pasheva, Sussman: track 3 in 7 black circles. Red dot appeared. 70% of people not on a call noticed, but 10% of people on a call noticed.
Divided attention bad for when something unexpected happens, eg. child running across the road.
Constructivist vs ecological approach
Constructivist: information received by senses is often ambiguous, so the mind actively uses clues and heuristics to construct what we experience.
Ecological: the environment contains enough disambiguating info, which we discern by actively exploring it.
Seven sins of memory
Blocking
The feeling of there being something interfering with access to memory, even though the memories are intact.
Eg. Tip of the tongue phenomenon.