Download single feature

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Neural correlates of consciousness wikipedia, lookup

Vladimir J. Konečni wikipedia, lookup

Blindsight wikipedia, lookup

Optical illusion wikipedia, lookup

Psychophysics wikipedia, lookup

Transcript
Ben-Gurion University of the Negev
Dept. of Brain and Cognitive Sciences
NEURAL DATA-ANALYSIS
WORKSHOP
REACTION TIMES (RT)
 The basic premise underlying the use of RT in cognitive
psychology is the assumption that cognitive operations
take a certain and measurable amount of time .
 In addition, it is assumed that additional mental
processes add (more or less) linearly. If this is the case,
increased RT reflect additional mental processes.
 Let us assume for the time being that this is a
reasonable framework. Then, it is highly useful to have
a program that allows you to quickly collect RT data
THE VISUAL SEARCH PARADIGM
 In the visual search task participants are asked to
report the presence or absence of a target stimulus
among various numbers of distracter stimuli.
 If the distracter stimuli differ by a single feature you
usually find the “pop-out” effect: the RT to detect the
target is independent of the number of distracters.
 Conversely, if more than one stimulus dimension has to
be considered (conjunction search), you typically find a
linear relationship between RT and the number of
distracters.
 This pattern of results suggests the existence of feature
primitives, fundamental dimensions that organize and
govern human perception.
VISUAL SEARCH
Feature search
Conjunction search
O
X
X
O
X
X
O
X
O
O
O
O
X
O
O
O
O
O
O
X
O
O
O
O
X
O
O
X
VISUAL SEARCH
DEMO OF THE PROJECT
Demo in MATLAB
EXPECTED RESULTS
Correctly Identified the Presence of Target
2.6
Mean Reaction Time (sec)
2.4
Pop Out
Conjunction
2.2
2
1.8
1.6
1.4
1.2
1
4
6
8
10
Set Size
12
14
16
EXPECTED RESULTS
Correctly Identified the Absence of Target
4
Pop Out
Conjunction
Mean Reaction Time (sec)
3.5
3
2.5
2
1.5
1
4
6
8
10
Set Size
12
14
16