Reasoning & Decision Making Flashcards
week 8
what is reasoning?
- The action of thinking about something in a logical (or rational) way to make a decision
○ Use our existing knowledge to draw conclusions, make predictions, or construct explanations
§ Use what we already know to define an outcome, predict what is going to happen or to help us explain why something has happened.
what are the 2 types of logical reasoning?
- inductive
- deductive
what is inductive reasoning?
- Making broad generalisations from specific observations
- Observe something then make the generalisation
- E.G: Something happens that makes us question the generalisation based on something around us.
- Behaviour has to be reinforced to learn something from it
○ Essential for learning - Just because one thing has been done before, doesn’t mean that the same outcome will occur again.
what is deductive reasoning?
Reaching a specific, logical conclusion from general statements or hypotheses
what is the structure of deductive reasoning?
- First premise (or statement) - “P1”
- Second premise - “P2”
- Inference (or conclusion)
how is deductive reasoning related to problem solving?
○ Goal is to solve the reasoning task, but the solution isn’t always obvious!
what are the two types of decuctive reasoning?
- conditional
- syllogistic
what is conditional reasoning?
(reasoning with if)
○ Conditions behind the reasoning (if… then)
○ Logical operators included in premises
○ e.g., or, and, if … then, if and only if
conclusions can be valid or invalid
what are the 4 types of conditional reasoning problems?
- Modus ponens
- Modus tollens
- Affirmation of the consequent
- Denial of the antecedent
what is modus ponens?
AFFIRMATIVE (everything is true)
if A is true,
then B is true,
A is ture
therefore, B is true
conclusions are valid
what is modus tollens?
NEGATIVE (everything is not true)
if A is true,
then B is true,
B is not true
therefore, A is not true
conclusions are valid
what is affirmation of the consequent?
AFFIRMATIVE
if A is ture,
then B is true
B is true
therefore A is ture
conclusions are invalid
what is denial of the antecedent?
NEGATIVE
if A is true
then B is true
A is not ture
therefore B is not true
conclusions are invalid
how is deductive reasoning equal to unintrested reasoning?
- Examples of deductive reasoning do not account for:
○ The goals/preferences of an individual
○ An individual’s prior knowledge or expectations- Contrasts with how we reason in everyday life
○ Also known as informal reasoning
- Contrasts with how we reason in everyday life
what is the importance of prior knowledge?
markowitz et al (2013)
PROBLEM (1)
If a rock is thrown at a window, then it will break
A window is broken.
Therefore, a rock was thrown at the window
PROBLEM (2)
If a finger is cut, then it will bleed
A finger is bleeding Therefore, the finger was cut
- Both conclusions are invalid (affirmation of the consequent)
○ But, more likely to accept conclusion to PROBLEM 2 as valid
§ Couldn’t come up with other reasons as to why a finger was bleeding but could with how the window was broken.