Historical paradigms Flashcards
what are the two interactions of photons with tissue in optical imaging
absorption
scattering
what are 4 ways of absorption into tissue
energy of photon is transferred to tissue
heat production
photophoresence
fluorescence
what are two points about scattering
when tissue more active there is less scattering- it is more transparent
changes in blood oxygenation levels related to absorption levels
what are three advantages of optical images
inexpensive
safe
excellent spatial and temporal resolution
what are three limitations of optical imaging
relatively low signal to noise ratio
limited penetration of tissue
low transparency of white matter
what are two types of cognitive control
evaluative and executive
what is evaluative contro
refers to ability to monitor the internal and external environment for signals that indicate the demand exectutive control
what is executive control
adaptive ability to configure the cognitive system in accordance with complex, confusing or novel models
what is the control homonculus
many theorists declare the problem of control to be extrinsic to their current concerns
what are four examples of placeholders for unknown mechanisms
the will
control processes
central executive
supervisory attentional system
what is the modularity hypothesis
a one to one mapping of cuntion to physical levels
what is the aggregate field hypothesis
all sensations, all perceptions and all violations occupy the same seat in these cerebral organs
what are interference tasks used to measure
conflict paradigms
what are three examples of interference tasks
stroop
erikson
simon
what is the simon task based on
spatial stimulus response compatibility
