Research Interests
My
research is broadly concerned with the neural and behavioural
mechanisms underlying learning, memory, and perception. These
research programmes are run in close collaboration with postdoctoral
fellows Dr
Arman Abrahamyan and Dr Anna Thorwart, as well as
current and recently completed PhD students Nathan
Holmes, Thida Thein, Cara Wong, Manuella Ruzzoli, Regine Zopf, and Muhsin Karim.
They also
form part of ongoing collaborations further affield with Evan Livesey, Ehsan
Arabzadeh, Fred
Westbrook, Colin
Clifford, Mathew Diamond,
Carlo Miniussi,
Irina Harris, Dominic Dwyer, Michael Breakspear and Bob
Boakes.
Current issues in associative learning.
One major
current interest
concerns the nature of stimulus representation in Pavlovian
conditioning. Learning about relations among events is crucial for the
survival of any complex organism, allowing it to use the past to
predict the future and adjust its behaviour accordingly. Pavlovian
conditioning is an attempt to bring such relations into the laboratory
in order to isolate those that produce learning, describe its contents,
and specify its influences on behaviour. Most contemporary models of
Pavlovian conditioning adopt the association as an explanatory
construct and identify its formation with predictive error. But
fundamental to the approach is an appropriate description of the
stimulus representations that constitute the arguments of associations.
My
particular interest is whether these representations are more
appropriately identified with the elemental features
delivered by the sensory systems or with configural units that code for
conjunctions of features.
Other areas of
ongoing research include investigation of how animals use
information about their physical context to regulate their responding
in Pavlovian conditioning paradigms, and in particular how these relate
to phenomena of extinction and latent inhibition. Also, we
continue to investigate the nature of learned flavour preferences, and
in particular their apparent resistance to extinction.
Tactile and visual perception and integration.
Measuring perceptual
judgments about stimuli while manipulating their physical
characteristics can unconver which aspects of the signal are relevant
to perception and reveal the algorithms unerlying sensory processing.
Our work addresses the nature of neural coding in the somatosensory
system, and how this is affected by concurrent visual input.
Specific research projects are directed at investigating the perceptual
properties of simple tactile events (eg, vibrations and
moving surfaces), and the relationship between conscious awareness of a
stimulus and the sensory or behavioural response to that stimulus
Publications
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Click the PDF link at the end of each citation to download, or send an email to the address above to request the published pdf |
2013
(+ in press)
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Harris, J. A., Andrew, B. J. & Kwok, D. W. S. (2013). Magazine approach during a signal for food depends on Pavlovian, not instrumental, conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 39, 107-116. PDF
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2012
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Wong, C. L., Harris, J. A., & Gallate, J. E. (2012). Evidence for a social function of the anterior temporal lobes: Low frequency rTMS reduces implicit gender stereotypes. Social Neuroscience, 7, 90-104. PDF
Harris, J. A., Andrew, B. J. & Livesey, E. J. (2012). The content of compound conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 38, 157-166. PDF
Thorwart, A., Livesey, E. J., & Harris, J. A. (2012). Normalisation between stimulus elements in a model of Pavlovian conditioning: Showjumping on an elemental horse. Learning & Behavior, 40, 334-346. PDF
Karim, M., Harris, J. A., Morley, J. W., & Breakspear, M. (2012). Prior and present evidence: How prior experience interacts with rpesent information in a perceptual decision making task. PLoS ONE, 7: e37580. doi:10.1371/journal.pone.0037580. PDF
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2011
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Abrahamyan, A., Clifford, C. W. G., Arabzadeh, E., & Harris, J. A. (2011). Improving visual sensitivity with subthreshold transcranial magnetic stimulation. Journal
of Neuroscience, 31, 3290-3294. PDF
Harris, J. A. (2011). The acquisition of conditioned responding. Journal
of Experimental
Psychology:
Animal Behavior Processes, 37, 151-164. PDF
Colagiuri, B., Livesey, E. J., & Harris, J. A. (2011) Can expectancies produce placebo effects for implicit learning? Psychonomic Bulletin & Review, 18, 399-405. PDF
Harris, J. A., Gharaei, S., & Pincham, H. L. (2011). Response rates track the history of reinforcement times. Journal
of Experimental
Psychology:
Animal Behavior Processes, 37, 277-286. PDF
Ruzzoli, M., Abrahamyan, A., Clifford, C.W.G., Marzi, C.A., Miniussi, C., & Harris, J. A. (2011). The effect of TMS on visual motion sensitivity: an increase in neural noise or a decrease in signal strength? Journal of Neurophysiology, 106,
138-143. PDF
Abrahamyan, A., Clifford, C. W. G., Ruzzoli, M., Phillips, D., Arabzadeh, E., & Harris, J. A. (2011). Accurate and rapid estimation of phosphene thresholds (REPT). PLoS ONE 6: e22342. doi:10.1371/journal.pone.0022342 PDF
Rosenberg, H., Holmes, N. M., Harris, J. A., & Westbrook, R. F. (2011). Pre-exposure enhances recovery of conditioned responding after extinction. Learning
& Behavior, 39,
212-223. PDF
Harris, J. A. & Carpenter, J. S. (2011). Response rate and reinforcement rate in Pavlovian conditioning. Journal
of Experimental
Psychology:
Animal Behavior Processes, 37, 375-384. PDF
Andrew, B. J. & Harris, J. A. (2011). Summation of reinforcement rates when conditioned stimuli are presented in compound. Journal of Experimental Psychology: Animal Behavior Processes, 37, 385-393. PDF
Livesey, E. J., Thorwart, A., De Fina, N. L., & Harris, J. A. (2011). Comparing learned predictiveness effects within and across compound
discriminations. Journal
of Experimental
Psychology:
Animal Behavior Processes, 37, 446-465. PDF
Livesey, E. J., Thorwart, A., Harris, J. A. (2011). Comparing positive and negative patterning in human learning. Quarterly Journal of Experimental Psychology, 64, 2316-2333. PDF
Zopf, R., Harris, J. A., & Williams, M. A. (2011). The influence of body-ownership cues on tactile sensitivity. Cognitive Neuroscience, 2, 147-154. PDF
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2010
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Harris, J. A., & Livesey, E. J. (2010). An attention
modulated associative network. Learning
& Behavior,
38, 1-26. PDF
Hart, G., Harris, J. A., & Westbrook, R. F. (2010). Systemic or intra-amygdala infusion of the benzodiazepine, midazolam, impairs learning, but facilitates re-learning to inhibit fear responses in extinction. Learning & Memory, 17, 210-220. PDF
Lak, A., Arabzadeh, E., Harris, J. A., & Diamond, M. E. (2010). Correlated physiological and perceptual effects of noise in a tactile stimulus. Proceedings of the National Academy of Sciences, USA, 107, 7981-7986. PDF
Harris, J. A. (2010). The arguments of associations. In N. A. Schmajuk (Ed) Computational models of conditioning. Cambridge: Cambridge University Press. (pp 53-70). PDF
Holmes, N., & Harris, J. A. (2010). Latent inhibition. In C. Mitchell & M. Le Pelley (Eds) Attention and learning. Oxford: Oxford University Press. (pp 99-130)
Clifford, C.W.G., Arabzadeh, E., & Harris, J. A. (2010). Operating characteristics and awareness. In E. Perry, D. Collerton, H. Ashton, & F. Lebeau (Eds) New horizons in the neuroscience of consciousness. Amsterdam: John Benjamins.
Harris, J. A. (2010). Clever Hans. In: D. S. Mills (Ed) Encyclopedia of Applied Animal Behaviour and Welfare. CABI: Oxford. (pp 106-107).
Harris, J. A. (2010). Types of conditioning. In: D. S. Mills (Ed) Encyclopedia of Applied Animal Behaviour and Welfare. CABI: Oxford. (pp 124-125).
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| 2009
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Dwyer,
D. M., Pincham, H. L., Thein, T., & Harris, J. A. (2009). A
learned preference based on orally consumed sucrose persisted despite
the extinction of conditioned palatability changes. Learning & Behavior, 37,
305-310. PDF
Holmes, N., & Harris, J. A. (2009). The loss of latent
inhibition across compound conditioning. Journal
of Experimental
Psychology:
Animal Behavior Processes,
35, 328-339. PDF
Livesey, E. J., Harris, I. M., & Harris, J. A. (2009).
Attentional changes during implicit learning: Signal validity protects
a target stimulus from the attentional blink. Journal
of Experimental
Psychology: Learning, Memory, & Cognition, 35, 408-422. PDF
Hart, G., Harris, J. A., Westbrook, R. F. (2009). Systemic
or
intra-amygdala injection of a benzodiazepine (midazolam) impairs
extinction but
spares re-extinction of conditioned fear responses. Learning & Memory, 16,
53-61. PDF
Harris, J. A., Gharaei, S., & Moore, C.
A. (2009). Representations
of single and compound stimuli in negative and positive patterning. Learning & Behavior, 37, 230-245. PDF
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2008
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Arabzadeh E., CLifford, C.W.G., & Harris, J. A.
(2008).Vision merges with touch in a purely tactile discrimination. Psychological Science, 19, 635-641. PDF
Harris, J. A., Livesey, E. J., Gharaei, S., & Westbrook,
R.
F. (2008). Negative patterning is easier than a biconditional
discrimination. Journal
of Experimental Psychology:
Animal Behavior Processes, 34,
494-500. PDF
Harris, J. A.,
Clifford, C.W.G., & Miniussi, C. (2008). The functional effect of
transcranial magnetic stimulation: Signal suppression or neural noise
generation? Journal
of Cognitive Neuroscience, 20,
734-740. PDF
Mitchell, C. J., Harris, J. A., Westbrook, R. F., &
Griffiths, O. (2008).
Changes in
cue associability across training in human causal learning. Journal
of Experimental Psychology: Animal Behavior Processes, 34,
423-436. PDF
Harris, J. A., & Livesey, E. J. (2008). Comparing
patterning and
biconditional discriminations in humans. Journal
of Experimental Psychology:
Animal Behavior Processes, 34,
144-154. PDF
Thein, T., Westbrook, R. F., &
Harris, J. A. (2008). How
the associative strengths of stimuli combine in compound: Sum- mation
and
overshadowing.Journal
of Experimental Psychology: Animal Behavior Processes, 34,
155-166. PDF
Albertella, L., Harris, J.
A., & Boakes, R.
A.(2008). Acquired flavour preferences: Contextual
control
of adaptation-level effects. Quarterly Journal
of Experimental Psychology, 67,
227-231. PDF
Livesey, E. J. , & Harris, J. A. (2008). What are flexible
representations? Commentary on Melchers, Shanks and Lachnit. Behavioural Processes, 77,
437-439. PDF
Clifford, C.W.G., Arabzadeh, E., & Harris, J.A. (2008).
Getting technical about awareness. Trends
in Cognitive Sciences, 12,
54-58. PDF
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2007
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Harris, J.
A., Arabzadeh, E., Moore, C. A., & Clifford, C. W. G. (2007).
Noninformative vision causes adaptive changes in tactile sensitivity. Journal
of Neuroscience, 27, 7136-7140. PDF
Boakes, R.
A., Albertella, L., & Harris, J.
A. (2007).Expression
of flavor preference depends on type of test and on recent drinking
history Journal
of Experimental Psychology: Animal Behavior Processes, 33, 327-338. PDF
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2006 |
Harris, J.
A. (2006). Elemental representations of stimuli in
associative learning. Psychological
Review, 113 (3),
584-605. PDF
Harris, J.
A., Arabzadeh, E.,
Fairhall A. L., Benito, C., & Diamond, M. E. (2006). Factors
affecting
frequency discrimination of vibrotactile stimuli: Implication for
cortical
encoding. PLoS ONE, 1 (1), e100.
doi:10.1371/journal.pone.0000100 PDF
Harris, J.
A., Karlov, L., & Clifford, C. W. G. (2006). Localization of
tactile stimuli depends on conscious detection. Journal
of Neuroscience, 26, 948-952. PDF
Harris, J.
A. (2006).
Psychophysical
investigations into cortical encoding of vibrotactile stimuli. In: R.
Romo and
M. E. Diamond (Eds). Percept,
decision, action: bridging the gaps. Novartis
Foundation: London,UK.
(pp 238-245).
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2005 |
Clifford,
CWG & Harris, JA (2005) Contextual modulation outside of
awareness. Current Biology,
15, 574-578. PDF
Harris, J.
A. & Thein, T. (2005). Interactions between conditioned and
unconditioned flavor preferences. Journal
of Experimental Psychology: Animal Behavior Processes, 31, 407-417. PDF
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2004 |
Harris, J. A., Shand, F. L., Carroll, L. Q., & Westbrook,
R. F. (2004). Persistence of preference for a flavour presented in
simultaneous compound with sucrose. Journal of Experimental
Psychology: Animal Behavior Processes, 30,
177-189. PDF
Harris, J. A., Thein, T., & Clifford, C. W. G. (2004).
Dissociating detection from localization of tactile stimuli. Journal
of Neuroscience, 24, 3683-3693. PDF
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| 2003 |
Diamond, M. E., Petersen, R. S., Harris, J. A., &
Panzeri, S. (2003). Investigations into the organization of information
in sensory cortex. Journal
of Physiology, Paris, 97,
529-536. PDF
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2002 |
Harris, J. A., Miniussi, C., Harris,
I. M., & Diamond, M. E. (2002). Transient storage of a tactile
memory trace in primary somatosensory cortex. Journal
of
Neuroscience, 22, 8720-8725. PDF
Harris, I. M., Harris, J. A., & Caine, D. (2002).
Mental rotation deficits following damage to the right basal ganglia. Neuropsychology,
16, 524-537. PDF
Westbrook, R. F., Iordanova, M., McNally, G.,
Richardson, R., & Harris, J. A. (2002). Reinstatement of fear to an
extinguished conditioned stimulus: Two roles for context. Journal
of Experimental Psychology: Animal Behavior Processes, 28,
97-110. PDF
Diamond, M. E, Petersen, R.S., & Harris, J. A.
(2002). Sensory learning and the brain's body map. In: R. J.
Nelson (Ed.) The Somatosensory System: Deciphering the Brain's Body
Image (pp 183-195). CRC Press: Boca Raton, Florida.
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2001 |
Harris, J. A., Harris, I. M., &
Diamond, M. E. (2001). The topography of tactile learning in humans. Journal
of Neuroscience, 21,1056-1061. PDF
Harris, J. A., Petersen, R. S., &
Diamond, M. E. (2001). The cortical distribution of sensory memories. Neuron,
30, 315-318. PDF
Harris, J. A., & Westbrook, R. F.
(2001). Contextual control over the expression of fear in rats
conditioned under a benzodiazepine. Psychopharmacology, 156,
92-97. PDF
Harris, I. M., Harris, J. A., &
Caine, D. (2001). Object orientation agnosia: A failure to find the
axis? Journal
of Cognitive Neuroscience, 13, 800-812. PDF
Harris, J. A., Harris, I. M. &
Diamond, M. E. (2001). The topography of tactile working memory. Journal
of Neuroscience, 21, 8262-8269. PDF
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2000 |
Harris, J. A., Gorissen, M. C.,
Bailey, G. K., & Westbrook, R. F. (2000). Motivational state
regulates the contents of odor-sucrose associations. Journal of
Experimental Psychology: Animal Behavior Processes, 26,
15-30. PDF
Harris, J. A., & Diamond, M. E.
(2000). Ipsilateral and contralateral transfer of tactile learning. NeuroReport,
11, 263-268. PDF
Westbrook, R. F., Jones, M. L.,
Bailey, G. K., & Harris, J. A., (2000). Contextual control over
conditioned responding in a latent inhibition paradigm. Journal of
Experimental Psychology: Animal Behavior Processes, 26,
157-173. PDF
Harris, J. A., Jones, M. L., Bailey,
G. K., & Westbrook, R. F. (2000). Contextual control over
conditioned responding in an extinction paradigm. Journal of
Experimental Psychology: Animal Behavior Processes, 26,
174-185. PDF
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| 1999 |
Harris, J. A., & Westbrook, R. F.
(1999). The benzodiazepine midazolam does not impair Pavlovian fear
conditioning but regulates when and where that fear is expressed.
Journal of Experimental Psychology: Animal Behavior Processes, 25,
236-246. PDF
Harris, J. A., Petersen R. S., &
Diamond, M. E. (1999). Distribution of tactile learning and its neural
basis. Proceedings
of the National Academy of Sciences USA, 96,
7587-7591. PDF
Diamond, M. E., Petersen R. S., &
Harris, J. A. (1999). Learning through maps: Functional significance of
topographic organization in primary sensory cortex. Journal
of
Neurobiology, 41, 64-68. PDF
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| 1998 |
Harris, J. A. (1998). Using c-fos
as a neural marker of pain. Brain
Research Bulletin, 45,
1-8. PDF
Harris, J. A., & Westbrook, R. F.
(1998). Benzodiazepine-induced amnesia in rats: Reinstatement of
conditioned performance by noxious stimulation on test. Behavioral
Neuroscience, 112, 183-192. PDF
Harris, J. A., & Westbrook, R. F.
(1998). Retroactive revaluation of an odor-taste association. Animal
Learning & Behavior, 26, 326-335.
Harris, J. A., & Westbrook, R. F.
(1998). Evidence that GABA transmission mediates context-specific
extinction of learned fear. Psychopharmacology, 140,
105-115. PDF
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| 1997 |
Carrive, P., Leung, P., Harris, J.,
& Paxinos, G. (1997) Conditioned fear to context is associated with
increased Fos expression in the caudal ventro-lateral region of the
midbrain periaqueductal gray. Neuroscience, 78,
165-177. PDF
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| 1996 |
Harris, J. A., & Westbrook, R. F.
(1996). Midazolam impairs the acquisition of conditioned analgesia if
rats are tested with an acute but not a chronic noxious stimulus. Brain
Research Bulletin, 39, 227-233. PDF
Harris, J. A. (1996). Descending
antinociceptive mechanisms in the brainstem: Their role in the animal's
defensive system. Journal
of Physiology (Paris), 90,
15-25. PDF
Harris, J. A., Corsi, M., Quartaroli,
M., Arban, R., & Bentivoglio, M. (1996). Upregulation of spinal
glutamate receptors in chronic pain. Neuroscience, 74,
7-12. PDF
Harris, J. A., Guglielmotti, V., &
Bentivoglio, M. (1996). Diencephalic asymmetries. Neuroscience
and
Biobehavioral Reviews, 20, 637-643. PDF
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| 1995 |
Harris, J. A., & Westbrook, R. F.
(1995) Effects of benzodiazepine microinjection into the amygdala or
periaqueductal gray upon the expression of conditioned fear and
hypoalgesia in rats. Behavioral Neuroscience, 109,
295-304. PDF
Harris, J. A., Westbrook, R. F.,
Duffield, T. Q., & Bentivoglio, M. (1995). Fos expression in the
spinal cord is suppressed in rats displaying conditioned hypoalgesia. Behavioral
Neuroscience, 109, 320-328. PDF
Grassi-Zucconi, G., Harris, J. A.,
Mohammed, A. H., Ambrosini, M. V., Kristensson, K., Bentivoglio, M.
(1995). Sleep fragmentation, and changes in locomotor activity and body
temperature in trypanosome-infected rats. Brain
Research Bulletin, 37, 123-129. PDF
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| 1994 |
Harris, J. A., & Westbrook, R. F.
(1994). Effects of midazolam and naloxone in rats tested for
sensitivity/reactivity to formalin pain in a familiar, novel or
aversively conditioned environment. Psychopharmacology, 115,
65-72. PDF
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| 1993 |
Harris, J. A., McGregor, I. S., &
Westbrook, R. F. (1993). Low and high doses of midazolam differentially
affect hypoalgesia in rats conditioned to a heat stressor. Psychopharmacology,
111, 62-68. PDF
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| 1992 |
Westbrook, R. F., Harris, J. A., Good,
A. J., & Paxinos, G. (1992). Effects of an infusion of morphine
into the accumbens nucleus upon acquisition of hypoalgesic and fear
responses in rats exposed to a heat stressor. Quarterly Journal of
Experimental Psychology, 44B, 99-124. |
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